Have you looked at the Ortur line of engravers? Their initial claim to fame was their mini Laser Master which is basically just 2 extruded aluminum shafts joined at the corner. It’s fairly compact.
See here:
Amazon.com: ORTUR Laser Master, Mini Portable 15W Laser Engraver, 32-Bits Motherboard Laser Engraving Cutting Machine, DIY Laser Cutter for Wood and Metal,150x130mm Engraving Area
Ortur has since moved onto more elaborate models but still sell the mini models. As far as I know they are well maintained and work fine in LightBurn. I have an Ortur Laser Master 2 which has a larger work area but basically shares a lot of the same guts as the mini model. The machine is reasonably well made and I had to assemble it myself. All parts are clean and fit well. It basically worked as advertised once I got past the initial learning curve.
Have I had problems with the unit? Absolutely. There is a well known issue with grounding that Ortur acknowledged and eventually made a free grounding kit for. My laser module degraded in power after only a few hours of use but again, Ortur came through and replaced it free or charge. I’ve been very satisfied with Ortur’s responsiveness and eagerness to address issues. They’ve been reasonably good with firmware updates to address known issues as well. Gil from Ortur who goes by @OrturTech on this forum is very active here and is extremely knowledgable and does an excellent job of addressing issues.
Leaving now before I sound too much like a shill.