Thank you. Yes, I do plan on upgrading the base at some point and will be considering a centre mount. There's a printing plan for one which specifically attaches to the Poang.
Working on that at the moment. I'm waiting on a few parts (clamping knobs etc) but the woodwork is mostly done.
Once the 4 main parts are complete, my estimate is around 3-4 minutes to assemble or disassemble. I'll time it once done.