tanks 1/32
#2
Most are too small for that and I don't know of any that come that way.
#3
I think 1/32 is too small for Airsoft. The 1/24 scale is the smallest scale I've seen with the plastic BBs. However Tamiya does have 1/35 scale tanks with infrared combat function. I don't have any of those so I can't comment on how good or bad they may be.