You see this in Ghost in the Shell (bioroids), Appleseed (bioroids), Xenosaga (Realians), Mass Effect (Keepers), Halo (Huragok), Warhammer (Jokaro), StarCraft (Zerg and their Buildings), Blade Runner (Replicants), Star Trek (Species 8472 ships), Metroid (Metroids, Aurora units) as well as in the book All Tommorrows (Colonials, Modular people's technology).
why couldn't someone make a machine using biological components, for example, a computer system?
For a fundamental reason: we know how to wire transistors, resistors, capacitors and inductances to make an integrated circuit which will end up making a computer, but we don't know how to wire neurons to make a working brain.
Like someone said
If our brain was ...
Any radius (obviously larger than Deimos) will do, it will only change the angular velocity required to achieve the desired acceleration.
The rotation of a solid ring around an object is never a stable configuration, so you're always going to need ACS to keep Deimos in the center of the ring.
For greater efficiency, possibly some sort of wheel-spoke system ...
Instead of a Roman road, build a plank road.
The Romans built roads to last indefinitely. You don't need that. If you have ample wood you can cut it down and build a plank road, fast. I knew there were plank roads in the US but I had no idea how extensive they were until I read the linked Wikipedia.
Yes, but it would be an amusing but impractical toy.
The Medievals were smart enough to realise that complex, cumbersome devices were not going to be as effective as more basic but functional ones. Especially when you're handing them out to squaddies, simplicity and ruggedness are essential.
This Answer (from History SE) might be of some use.
The long and short of it is between 1 1/2 to 2 yards of 16 foot wide road per man per day.
According to the Twelve Tables, roads were to be constructed 8 foot wide (where straight) and 16 foot wide (where curved). Later it became common for roads to be 12 foot wide, which would accommodate the passing of ...