Most people just grab some pvc for the finder scope conversions, really you should go a .965 to 1 1/4 and use an extension tube but hey thats money. I wouldn't use a truss setup though sounds to dodgy, just get pvc white and match it up nice. this may give you some idea's
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1
and here
http://msfastro.net/articles/finder_guidescope/