Understand that. Here's a tip or two that might be useful then. Pick up a new set of axles. The ones that come from the manufacturer are a little soft and I still haven't figured out what size the hex heads are on them. Some of the 4-40 hex screws that come from the original manufacturer have pretty rounded hex inserts and won't permit tightening. No big since 4-40 screws are prolly laying in the bottom of your flight box. Better still, toss the 4-40 hatch screws and blind nuts and tap the hatch tabs for a 10-32 screw, or metric equivalent. Use an 8 or 10-32 or metric hex head nylon screw in place of the 4-40 metal screws. They never loosen up.

1-1/4" servo arms is correct, but you'll prolly end up using the hole at the 1-1/8" mark. As for the turnbuckle pushrods I couldn't say since I made my own with 4-40 all thread inside carbon rods. Maybe 1/2 gram heavier overall but many $$ cheaper. In the long run they are just as strong and adjusting one end is easy.

Take some thin ca glue and squirt a line all the way around the thin balsa wing pockets to stiffen them up. It's real easy to put you finger through one otherwise. Other than the above, assemble it the way it comes out of the box. It's a great flying plane and I believe you'll love it for IMAC.