Time to fix the bed down. I want to finalise the work holding at the same time. I have a few choices,

1. Drill and tap a grid of holes in the plate and bring these holes up through the spoil board,
2. Just drill and tap the spoil board (pvc foam) creating blind holes.
3. Cut t-slots into the plate and create narrow planks of spoil board between them (I would need to get a special bit to cut the t-slot),
4. Create t-slots from planks of spoil board, not sure how strong they will be.

T-slots are probably more work but less tapping, what do people think?