I have an avistar with a .46 LA on it. It went together pretty easy but I changed a few things.

After 4-5 landings (even good ones) the wire landing gear started to sag. It would probably last forever if you bent it back after every few landings but I changed it to the DuBro fiberglass peice. Plus after a while I'll slide it forward and make a taildragger out of it - plus I painted it to match the plane and it looks pretty sweet I get lots of comments. I added a plywood doubler to the floor to put blind nuts in and mounted the landing gear with nylon bolts - hopefully it will shear off if I dumb thumb it.

The only other thing I changed was in the fuel tank bay I made room for foam around the tank and made a hatch over it.

I added some triangle stock to the vertical stab (but it's hard to get a very big piece because of the pushrod exits) and some triangle stock around the firewall, and the formers in front and behind the radio bay.

I also gap sealed the hinges on the ailerons cause I had a small gap cause the aileron horns are already installed and don't go all the way in.

I ripped off all the avistar trim down to a plane white plane and then trimmed it out like I wanted. I painted my muffler with high heat brake caliper paint to match the engine and used that metallic blue as an accent in my trim scheme. Also painted the front wire landing gear the same blue after I got all the chrome off.

It flies great to me and my instructor said at the field "You can fly 10 ARF's of the same model and 1 of them just flies better - this is it".