5955's will fly a 40% plane just fine so yes you will be fine especially on 1" Arms. I am planning on using the stock DA 50 muffler...light and cheap.

Dont mount your rudder servo until everything else in the plane is in place. From there trial balance to see if you need weight up front or in the tail. Thats not so much my idea but from the WH manuals and it makes sense.

4 Cell Duralite, Fromeco, TBM lightest redundant setup and any brand only as good as your regs. If running one reg, use a 20amp rated one.