http://www.ww2aircraft.net/forum/aviation/fw-187-german-51-a-38757.html?highlight=
http://www.ww2aircraft.net/forum/aviation/fw187-fighter-bomber-ground-attack-aircraft-40741.html?highlight=
I've sort of broached this comparison before with other aircraft, but the more I read about the P-38...
following the light field howitzer race, here that for the heavy howitzer
my proposal for the requirements:
actually fire in combat in WW2
shell 90 kg or heavier
time to ready max 1 hour
max range 12 km or more