>>11013967These are all buildable in real life, and I actually do painstakingly put efforts towards making them playable as well - they should be able to withstand basic play at least. I am able to put out a parts list from the programs I use along with automatic instructions from LDD (which may be a bit off), if you're serious. Keep in mind though I build digitally so I have infinite bricks - while every brick I use exists in real life, some of them are quite rare, like the Sand Green ones. The green one's bricks would cost about 200 from Bricklink, last time I checked.
Here's another MOC, it's basically an unholy amalgamation of a Russian BTR-70 APC and an MTLB artillery tractor.