Hi Matt
I may have an idea (it is only an idea) to fix your problem with "draw tube travel" you need to move the main mirror towards the front of the scope by about an 1" to 1 1/2" so that you can use the focuser with out the extention.
If I remember correctly the primary mirror cell is a push/pull type configuration for collimation purpose. Replace the original bolts with bolts that are about 1 1/2" this should move the main mirror forward by about an 1"+, this will fix the focuser travel problem. This mod should cause no problem with the performance of the scope.
Anthony
P.S. Forgot about the springs they will need to be replaced. Problem can find better ones then whats in the scope now. Also should have thought about this, "Balance", by moving the mirror forward the balance of the scope in the cradle will change.
Anyway it was just an idea.
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Originally Posted by matt
The overall height of the unit is a full inch shorter than the Skywatcher stock standard R&P focuser. So there's your focus problem 
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