JPT's Lower and Upper Vertexes for MendelMax

I wanted to have Lower Vertexes that are easier to mount, but do not increase the height of the MendelMax. To achieve this in a single piece, I had to move the diagonal misumis 10 mm from the center. This requires new, wider Top Vertexes as well.
In numbers, its 10 mm taller, and the frame triangle is about 20 mm wider (in Y direction), but this doesn't increase the base size of the MendelMax
Advantages:
- easier to mount
- about 13 mm gain in printing height
- standard 1 kg PLA spool