I needed to move the spoilboard since the LR4 offers more Y for the buck. Had to move the spoilboard a little to the front, still need more spoilboard. But I might just leave it open in the front to be able to park the CNC with a bit in it.
While being at it, I added some seals (I had taken out earlier, because they are not quite large enough. Maybe that will help the suction table. 
I still have to find a good option to fasten that spoilboard. Maybe I’ll add a few drops of Titebond and just glue it on? At least a bit? Not sure about that yet, but might be the only good option.