It will work fine Dan.. Your dob alt bearing will run smoothly on the teflon points you mount it on .. dosn't matter if its a triangle or just suspended in space .. if those four small points of contact are all equal and spaced accordingly (angle wise) through your alt axis it can't not work.
The SWA site is great in that the info is structured around limited tools and experiance in regard to making your own scope .. triangles
(Straight edges ) are easy to cut , the mounting points are no differant to a nice curve cut with a router, dosn't look as pretty ..just easier to do if you have a hand saw and a little determination
