welcome xoon, here are a few tips
saito 100 works great, just need the 60size mount and redrill holes in firewall.and mount 1/4 in above marked thrust line.
gear block is weak, just dont use wheel skirts or you will end up with holes in your wing, and when it breaks on a landing it comes out clean, just beef it up then.
saito 100 only weighs 21 oz and cg's with this plane great.
dont use the cowl mount blocks, just screw right into side and into firewall blocks(that are inside).
ill leave the servos to some of the other guys because i use jr537s and they work great for me but i would really like to get some hitec 645's.
also oon, you need to get the engine as close to the firewall as possible eithout hitting the mount screw
HERE ARE SOME PICS