Techjet1,
The reason for the Balsa Super Bandit's existance is two-fold. It has about 35 sq. in. of wing area more than the composite version, and has larger flaps than it's composite brother. In the USA, it is about $1,000 cheaper too.
The idea behind the larger wing is to reduce the wing loading, by increasing the size, and reducing the weight of the whole airplane.
The airplane has about an 8% geometric fuselage volume increase over the original Bandit to allow more installation room, and provide the volume needed to increase the fuel supply. It also comes in a pound lighter. I've built two composites, three balsa versions, and now my first Super Bandit, a balsa version. I really like the new design.
By far, the Super version fuselage build-up is much easier than the legacy airplane, and as well, contains some very much appreciated changes in construction, as a result of BVM increased experience. There are a myriad of improvements in the new airplane, making it a much easier to construct aircraft, and a better flyer.

I don't agree with the idea of eliminating the kevlar fuel cells. They are designed to fit the airplane, and are much less complicated than any other method. They also have much better hardware than the Du-Bro type. Any plastic fuel tank won't fit the tank area within the fuselage the same as the kevlar.

No speedbrake? Why not build it and keep it closed, enabling you to make it operational in the future? I like the ability to use the brake, and and keep the engine RPM up so it will spool up quickly when/if needed. Be advised, that you can build it any way you want to...don't use the inner landing gear doors unless you want to clean it up completely. If you have a very small engine, you might appreciate the extra cleanliness (reduced drag) the inner doors provide.
When I built my new Super Balsa Bandit, I was able to build and rig the entire door system in a couple of evenings. It's not hard to do.

The Super Balsa Bandit is just not designed for 11-12 lbs of thrust. You can run a larger engine and throttle it back, rather than keep a little hummer turnin' anrd burnin' as fast as it will go.
I wouldn't try to guesstimate the speed of your super light (but draggy) doorless version.

If you build it like the plans, you won't go wrong. It will also have better market value should you choose to part with it.
For your first turbine aircraft, I feel that you might have more success by building it as designed.

Just my $0.02 worth..............no flame war intended.
Regards and best holiday wishes,

Harley Condra
BVM REP
Team JetCat