I feel you could easily reduce the pivot to base length… but you’d need to do some calculations in advance before making the cuts. I wanted a large base box for storage purposes of tools etc… My vac fits in it as well. Regarding securing the LR2 - I have drilled two holes through the table, one at each end of the X axis tubes. A long bolt passes through a piece of ply that pushes against each tube holding it securely to the table. I have a couple of wing nuts under the table to do it up hand tight so not too mcuh pressure is applied to the tubes as I not want to go bending them.
The under table shelf I don’t really like as it hinders the possibility of mounting a table saw beneath the table which I’d really like to explore. Having said that the problem then arises of having the table saw poistioned very high up when the table is stored in its vertical position which is unsafe.
note: I’ll post a few pix in my build post of my current setup.