Cheers, I was reading Iwant1's build thread yesterday realized I was trying to rush this project and that something was going to go wrong if I didn't slow down, do a bit more homework and spend longer on the design. I really wanted to get this done in the time I have off but it looks like that was more than a little optimistic, perhaps it will be ready for the end of next year :-)

As I've now got a lot more time I'll seriously consider using the 2010's instead. Over all I think the cost is going to be about the same but better acceleration would be nice to have. I have to admit I hadn't realized how big the 34 motors were until I imported one into the model. It's a chunky bit of kit compared to the 23 package.

Based on your advice in another thread I've moved the screw up to be level with the rail as well as increased the plate to 10mm.
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The motor housing has been dropped to 15mm plate. It already has a cut out to allow better shaft protrusion but I've realized I'll need to slot the cut out and mounting holes to provide tensioning capability.
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I think the frame design is pretty sound so I'll aim to get that built over Christmas (I've got to build something or I'll go stir crazy) and then work on the rest of the design in parallel.