Just for fun: take PZL42 in QMB, place it at very low altitude and put some formidable fighters against your planes. If you appoint "unlimited ammo", and "no-damage" then your task could be to cover your planes with fire from rear gunner against the fighters.
I can say that PZL42 is one of the best planes for the fun-mission due to its nice rear-gunner field of view and fire (TB-3 is even better from this points but TB-3 is too large and therefore vulnerable for enemy fighters).
The only problem from this aspect is that PZL42 defensive firepower is not enough to cover your planes from fighters like Fw-190, Il-10, etc.
So the question is: it is a simple way to modify PZL42 rear guns into something with stronger firepower? For example to change it into M3 Browning with a lot of ammo (or unlimited ammo) or even 20mm cannons from Fury-jet? This would be nice fictional version just for fun!
Thank you!