We've got guys that bolt a Saito 115 to the front end of a SIG Somethin' Extra (a 40 size plane). And, it was (and still is) his 2nd plane. The .51 should pose absolutely NO problems.

SIG makes for a great build. I've done a couple of the 4Star60 flavors (Saito 91s & YS 110). My only suggestion is to use tri-stock to reinforce the firewall to the fuse sides & fuse bottom.

Have fun ...

Oh yea, have you run the ST yet? How long has it been since it was last used? Just thinking about bearings & whether it was stored with after run oil to keep things clean on the inside.