LISA Simpson Take 2

The original LISA prototype was a success. She was such a success that I have no plans on taking her apart to reuse the components. (My original Simpson design has long since been scavenged.) As far as print quality, the only problem is from screw wobble artifacts. I have already posted an updated design in my gitHub that uses screws that are 2.5X stiffer which will allow the acceleration to be increased and should remove the wobble. The original LISA had some slight backlash artifacts (barely visible) but nothing that I would call a deal breaker. For now I have no plans on addressing the backlash. (Possible solutions including buying a anti-backlash nut or spring loading two nuts against each other. Both solutions add costs and according to my decision making process, removing the backlash is not worth it.) Other than the backlash and the wobble, there were only two remaining "problems".

1) She took up a 500mm diameter area for a 225mm diameter printing area.
2) She didn't fully utilize the full length of her screws.

Thanks to uncle_bob trying to squeeze a mega LISA through a doorway. We figured out a more compact arrangement for the support columns.

To better use the screws length I am dropping the bed down. This has an added benefit of letting me physically level the bed on the fly and will let me access the electronics without more intensive dissassembly.

So here is the rendering of my proposed redesign. Missing a few parts but this should get the idea across.
[attachment 24835 lisa.jpg]

She now can fit in a 400mm circle and has about 35mm added to the print height.

It is going to be a while until I build my second LISA. Do you guys/gals have any comments or suggestions?