Hello!
I have found this pic on the web:
But I think this is some kind of newer machine, not a BTR-70. Thing is, Soviet troops didn't do much riding on top of the vehicle. In Europe the weather is not so good, it's only seldom very hot, and the machines were built for heavy fighting, going right after the tanks. Lots of flying lead was expected in the air, not to mention the fallout and radiation, so the doctrine was more like riding inside and quick dismounting at the target (check out the side doors, between the pairs of wheels).
Hope it helps, have a nice day and good luck with your build
Paweł