Charles,

I don't maintain the website, so look for a contact information, if that fails let me know
The left and right wing can be the same span, remember you are building a scale model so the outliines need to be correct
The skid might be a problem, I flew a Howard DGA-3 Pete with a skid and it wouldn't taxi well at all and had to put a tailwheel on the model
Regardless if you install the 3-line or electronics the system will work
the Bravo had a 80" or 89" span and came in at 17 lbs, a monster with 60' lines

I would put the 55" span model with 60' lines.

the trimming process starts off by taking slowly to determine if the CG is too far forward or aft. If the CG is too far forward the airplane will nose over and require full up elevator to fly level. If too far aft it will be sensitive. Don't cram the power on the first fliight, take off slowly to determine how the model will handle before climbing out to cruise height. Once the CG is the correct location, then move the leadout guide to adjust the line tension within reason.

the Gee Bee will mostly like need full up elevator when you start the takeoff run to keep the nose from pitching over during the takeoff run. When the elevator is effective then you can relax on the elevator and climb out.

Good luck!

If buildiing RC you would....
always install a throttled engine
have the wing be removable
use a starter

if building CL you would (if you follow traditional history)
put a engine without throttle
Make a one piece airplane
make smaller than 60" span
never use a starter
fly aerobatics

The models I build for CL scale break all of the CL traditional rules....I install throttle, make it look like a RC model but follow RC rules with a bellcrank.