Hello; I have one of those, I have a servo in each lower wing with connecting links going to the top wing. I would use different wing ribs where the interplane struts attach, the kit comes with light ply ribs, I would use these as pattern and make new ones out of aircraft ply. When the tabs break off it is difficult to fix it without a major effort, so if you have light ply in there, you won't have that problem.

I use a Saito 91 on mine, I had a Saito 120 on it but that made the plane too heavy for my style of flying. I have a Graupner 13x8 3-blade prop on it.

I didn't change the top wing mount, and I wish I had as it's difficult to remove the top wing and get it back on properly. I used the hardware that came with the kit, and had no problems with it.

It's a super flyer that presents well in the air, mine flys surprisingly slow, it won't hover with the 91.

Oh I changed the landing gear to aluminum in the second year as the wire gear bent back and had the wheels toeing out too much to get much speed up on take-off.