I think I have a serious humidity problem in my shop causing necessary resurfacing frequently of the MDF spoilboard. When I bought my CNC last December I also got the 4th axis rotary (uninstalled and still uninstalled). Has anyone converted their Probotix unit to an aluminum T-Track system? I'm thinking the aluminum would be better and reduce the 25"X37" to about 25"X30" and install the 4th axis rotary. If I were to put the 4th axis on now I would have to remove the bed completely to install it. Any ideas or suggestions from you more experienced folks?