I would have replied earlier but didn't see this until now.
I ordered the RecRoomMasters 32" Pro Upright Xtension Arcade 4-player Ultimate Edition back in February and was delivered in March.
My kids and I had assembled it in about 4-5 hours total over two nights.
For the podcast/YouTube channel that I co-host I ended up recording the entire build process and put it up in real-time over 10 videos (each about 20-25 min in length) and one video that was sped up 32x to fit in about a 6 min time span.
I've not been able to get track-ball games to work with it, but everything else that I've tried works great. (track-ball does work as a mouse when out of MAME).