RE: rudder requirements
I got the rudder stuff from SWB, although he and I argued as to what size.
It involved a bit of work installing but is a nice double truss setup.
I think I went with 4.5 as otherwise it hit the fuse,he wanted to sell a 4" in.
If it was offset towards the rear using a single threaded rod design that would have worked just fine, just get the offset right on the servo arm and with the horns.
The SD uses a single threaded rod and its fine even tho the rudder is too big.
At the time Al had plenty of Kletts, I see that both SD and Quique use something similar, you may ask them if they will sell some...otherwise theres only the Dubros and you could either use a continuous hinge (especially for the rudder) or make small hinges out of piano wire and not use the cotter pins supplied.
I installed mine with Probond yellow glue as per Al, just make sure you wash them and sand lightly, been in at least 1 1/2 years just fine, and it gives you work time as theres a lot of hinges!!!
Instrument panel I made from a jpeg I downloaded somewhere on here, used photo paper.
7955 seems to have a bit more torque than the 5955 so worth a look at.