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I guess I should have included some additional detail in my first post:
Objective is to build a fully featured 10" Dob that basicaly only takes up one passenger seat in a car for transport and a similarly small volume for storage.
This then determined the use of a truss tube design and most importantly the ability to "nest" the UTA inside the mirror box. The "nesting" requirement has driven the use of a formed ply tube for the UTA (to minimise the diameter) as opposed to the more traditional cage design.
Large diameter altitude bearings and an azimuth bearing diameter no larger than the mirror box width, result in a small/compact rocker box. The altitude trunions will be removable without tools if required.
This is only a small 10" scope and weight/size control is not as critical as for larger scopes so compared to a larger scope, an oversize mirror box is of no great concern.
I have attached some images of the 8 inch taken torwards the end of construction, before the altitude trunions were fitted, that show the concept.
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