end of the spur

[faraway]

..... some people may say its over engineered, .....

Not at all. Do you remember Gary from Houston? He used a solid wooden block to build his bank and he has a layout that will never move. I think it is not a bad thing if a solid kernel or wall like yours defines all right angles etc. and you can fully concentrate on the optical aspects. I think I would like to do it too if I had a stationary circular saw.