Hi Rob,
The 10" scope is still many months off. I have ordered the mirror from Mark but have asked for June or July delivery to give me plenty of time to do all the work on the scope around work and family commitments. It will have a protostar quartz secondary, a dual speed Feathertouch focuser, Argo Navis and Servocat junior.
The light shrouds on Peters' scopes and the Obsessions is made from black "ripstop nylon". You can buy this from any large fabric outlet like Spotlight. The zipper in the light shroud is a large nylon zipper you buy from Spotlight also. It is continuos roll and you just buy the length you want, they cut it off, then you sew it into the shroud. Having a wife who is a dressmaker by trade helped a lot in this regard
On the 18" Obsession the zipper is 600mm (2 feet) long. This is just enough to get the mirror box cover in and out through the zipper hole. I will have to work it out but on the 10" scope I would expect the zipper to be about 300mm (12") long.
Cheers,
John B