80mm Objective A Scope to be Built

Hello Everyone!I need some information on 80mm telescopes that have
been built at home.I just obtained an 80mm diameter achromat,focal
length 900mm and will soon build such a scope.I've seen a few 80mm
telescopes on the market,including one made by a company named GRAMPUS
priced at $165.95 complete with equatorial mount tripod eyepieces and
diagonal.It looks very similar to CELESTRON'S Firstscope 80,but my
scope will be made from parts of an old 3"(76mm) refractor and will
utilize a spiral wound focuser no rack & pinion.Thanks for your ideas
and suggestions.Clear Skies,GB