Lets see if this helps.

 A low wing.
Twin engines
Some fixed. some retractable undercarriage.
Crew of 3.
It had a long operational career in two wars.

 There you go, what an ugly B****R

 1 - Biplane - fabric covered

 2 - 3 engines

 3 - 4 crew

 4 - Tricycle gear  

  next clue after dinner if no correct guess's.

Can you imagine being the rear gunner and standing atop the center engine albeit in some sort of cage , but just inches away from the pusher prop?  you're up again, Alan!

OK, another random page choice from my book.

This one should be easy, we need some different winners.

 After winning say four times, I think that person, including me, should step away for a couple of quizzes.

Low wing monoplane

Radial engine

 2 Crew.

Big spatted undercarriage

 Not very successful.

Sorry, but no response until after 3pm CST as out of town until then.