Matt,
the Sig Somethin extra flies very well as a control line plane - you will need to look at the construciton of it however and not use the wing joiner tube - pretty easy to make a couple of extra ribs and put the wing through the fuse.
Ia m thinking of using the Something extra for electric as well - it is a nice looking plane - will be changing a few things on it tho......but that is just me being me