My engine pylon is 4" in width -- I extended the pylon LE by ~1/2" & the trailing edge by ~ 1 1/2".

I have 1 7/8" of rudder throw, measured at the lower corner of the rudder -- essentially everything that I could get.

It pitches to the belly on KE flight, but it is manageable -- it is easily capable of KE figure 8's, but it won't do a KE loop (at least mine won't).

Be conservative with your elevator throws -- the Seamaster can snap with too much elevator -- you will have to experiment to find the best throw for your plane -- it is dependent on wing loading (weight) & the C-of-G location.