I have three LowRiders (and have built about seven if you count a couple of LR4 beta iterations that don’t still exist). I started with LR2 carrying trim router (running on a SKR, a PCB meant for controlling a printer), upgraded it to LR3 carrying trim router (also SKR board, but then later upgraded to Jackpot board running FluidNC), then built another LR3 carrying a plasma torch, driven by LinuxCNC running on an old Acer laptop (with a touch screen!) combined with PCB boards made by MESA Electronics (a one-man operation, a guy who is brilliant and very generous), and then built several LR4 carrying trim routers, running on Jackpot board, and replacing the LR3 and leaving me with two LR4.
Here’s one of many videos I put out re. the plasma project: https://www.youtube.com/watch?v=DC7X0wB65kA
NOTE: My entire plasma build log, packed with helpful details is here on the forum: