the cg is what i heard not to placed at the point TS advice, tink i read some like 21 cm from L E, pleas dont take that for a correct place, need more searching before i want to say some more.
The prop have i heard about but i used a 16x12.5 w on my Twister with an DZ and it was wery nice in down lines ,so i try that first ...its what i have in house anyway, but i have what we used for the OS 140 rx the 18x10 sport, but it so heavy compare to the 16".
Belly pan is not thouched yet but it will be the ordinary in front and some outlet back.
did you use elevator servo in front or 2 place in the stabs?