First, leave town, NOW there is no way of completing in the time allotted.
So the engine people probably had decades while you slept, and now after the engines are mostly done you have to complete the ship in 5-8 years. You were really taken advantage of here.
I am going to assume technology kept its current pace, either that or you have a major plot point to explain. This means our technology should be 70-100 doubling faster or better than what we have today.
So your first bit of good news is 3D printers and/or replicators should be amazing by then. Probably able to print molecules.
Your biggest problem is going to be raw materials, another person said 100,000 metric tons for an aircraft carrier so 1000 is 100,000,000 tons and you have to get it into space.
I would suggest building in outer space.
- No pesky borders to respect, no you can't just steal russia's resources
- No governments to deal with
- You don't have to mine miles deep and risk cave-in's
- Mine's usually wreck a great deal of the surrounding area.
- The materials have to be in orbit anyway.
- It makes lifting heavy parts easier
- Lots of room to spread out with conflict with neighbors
So we are going to have to mine a great deal of the Kuiper belt. And your going to need vast fleets of 3D printers in space. Each one mass producing certain parts, and then lego'ing them together later. You will also need a vast mining fleet sending resources back to the shipyards at a steady pace.
Your best bet is if humanity has mastered E=mc^2 by then. Wherein, we can disassembly any matter and turn it in to any other matter with more/less produced depending on the density of the source and destination materials.
This way you won't have to waste any time searching for certain types of minerals.
All matter is converted to energy and the 3D printers use the energy, not only to print but power itself. So now as long as you have a stream of matter, your 3D printers will spit out parts.
Your going to have to send up a bunch of parts to get the process started. Especially 3D printers and robots we can control from earth to assemble the printed parts. Also mining robots to capture and bring back the asteroids.
You probably need to assemble a 3D printer which can manufacture a larger 3D printer in space. Until you have one that can 3D print a whole ship at once, or large pieces of it. Any manual assembly is going to slow you way down.
So you need a 1000 ship sized printers so you can be printing them all separately. In the meantime teams of people will be needed on Earth to control all of the automation. Also more teams to get the blueprints ready for the ships so you can begin printing the moment the printers are ready.
The idea you can get your ideas on how to build a battleship from socials is a bad idea. Probably one of the reasons your Dino business failed, and why your fleet of ships could turn out horribly wrong.
Instead, if you team up with the scientific and construction communities there will be plenty of good ideas. However, each ship will have 1000's of moving parts and will all have to be tested here on Earth before they are printed in outer space.
In order to meet your economic requirements things will have had to change radically on earth. Given current economic condition 1000 battleships could and would never be paid for in time. However, if things change to a Star Trek like universe regular money would be only a fraction of the currency. Also, if you were provided a house(3d printed/replicated to your design),transportation, food, education, and probably a few other things I forgot for free (or a greatly reduced price) then you would need significantly less money.
Say everyone is given a base amount of compensation, and depending on your job you will go up a little or a lot. Engineers get a lot, floor sweep a little extra. The future might be based on energy credits where you use energy at a replicator to produce the things you need/want. Using e=mc^2 that energy is turned into matter.
In our Star Trek like universe where people acted for the common good, the problem becomes a lot easier. Say the population had some sort of voting system, and if ##% approve it is done. Costs are meaningless because things are just done. You need a crane the crane company delivers a crane, but no money is exchanged because no one is directly being paid and no one needs money. Want a steak walk up to a 3D printer/replicator, select steak and there you go.
Yes, there are people doing jobs, but they all volunteer to do their jobs because all of their other needs are met. They all enjoy doing what they are doing because they were screened by computers and your perfect job is automatically known.
We struggle on with jobs because we need to pay bills. We only need money because other people expect money from us. In my world, this simply doesn't happen, only as an exception to rule. Lets say you want 100 room mansion, you will have to perform some task(s) that provide enough value to the community to earn it and the land because it is a huge luxury and not a need. As a scientist, lets say you invent or help invent warp drive, clearly you have earned it.