Sure you can make it but they will not function correctly. I had a good look at the BTR-70 and as I suspected - No commander, no hatches, no driver optics, gunner optics don't zoom
The fact that the driver has no optics alone makes it almost impossible to make and still have a human player drive without having to use 3rd person
If you would read the thread I posted earlier Sigma6 explains it very well I thought. Seems the only real option is to have the LAV behave like a tank which is very disappointing indeed, curse BIS and their short sighted coding.