Hi Adrian, Happy New Year.

Don't know what size of tank it is, it came with the plane. I guess 20oz. Prop is 18X11 Engel. U/C and U/C area on plane are all standard, I've done nothing to them. Yes that's a diffuser I got from Canada a few years back. Doesn't do much to the exhaust trail unfortunately but it does take a slight edge off the exhaust note.

Overall the model went together very easily. Took me about 10 (very!) leisurely days to complete. Only thing I found was the front tail tube was a touch tight, wing locators at the front needed a small amount of work for the front of the wing to go in and the screws for the aileron and elevator horns that goes all the way through the surface were too short (just changed them for standard HT M3 allen bolt). These niggles were very minor. The pilot also needed shortened by 1/2".

Will hopefully test fly it soon.

Angus