RE: New 35% Extra 300
That would be a nice thing to have pre made. I decided to go with the the dowel shape because i didnt think i could center drill the square stock perfectly and would end up with a side that was off and pretty bad glue joint. With the round dowel i can get a pretty good joint with out the sides being square to each other.
Also i was going to add 2 short tubes to guide my screw driver to the needles after i added the last side plate or just add a half plate to that side, easily done post build after every thing checks out.