Yeah, looks good. Hey, mods are why we build planes. They're one of the main reasons I don't have any ARFs at all - you can't create with an ARF or RTF. Only one I'd maybe think about changing is #2, but again - this is me. That counter balance is there for a reason. Of course, with electric power you've got the advantage of power to help where the balance works now, so it might just be fine.
I really like #5 & 6, REALLY LIKE! My own sailplanes (Airtronics Aquila, CG Gentle Lady, GP Spirit-100, AFI Super Monterey restoration & Bird of Time) all use sullivan gold-n-rods and all have embedded mini-servos controlling the spoilers (one in each wing) except the Monterey, which has no spoilers.