Thanks Mike! I'll be sure to post it all here. The IIS star party at Lostock is where I was bitten by the binobug as you know. Can't wait to start designing the hardware now - materials, mirror cells, electro-mechanical collimation systems, rotating cages, etc, etc, etc.......
Dave - I guess that there is a fair whack of theory to be applied first to come up with the appropriate dimensions of everything. Based on these I'll make a decision on what materials I'll use - nice wooden components or lots of aluminium & carbon fibre. I'll start to order accessories such as 3-vane curved spiders, focusers, truss joints, etc, etc now.
The journey begins!