I just did the bed on my 4t6 recently.
Thread here. Mine was a seven board. According to Mar-K their bedstrips are 1 1/2" with a 1/2" gap. I cut my own wood with measurements from another 4t6 here. To maintain a 1/2"gap I had to trim the outside boards a "hair". I think the most helpful information from my experience is to measure the cross members for alignment. Being that it is eight boards wide use your center line and start off the spacing with a 1/4" either side and work out. The two end boards will be smaller than the six according to Mar-K's instructions. Hope this makes some sense. Have fun and good luck
Dan
