I put a Mega 22/45/3E in a Sig 4 star 40 using 16 rx2400's(2x8), jeti opto 70A controller swinging an apc 10.5x6E prop..
Did not change anything except made a hatch from cockpit to firewall and cowled in the top of motor area. It worked very very well, convinced my-wet fuel- mentor to seriously start thinking e-flight. He said it was the sweetest 4* he's ever seen .

Jarvis