Yeah it's 32"-42" wide and almost 8' long...would have been longer but I lost ~6" due to some lateral sawmill "goof" cuts that I didn't want to deal with. I got lucky sourcing those slabs!
In re getting the straight line, I used a sheet of MDF for a fence and routed them (used a router jig to do the planing, as well). I had to do some tweaking after the first pass and I wish the joint on one side was a little tighter, but I'm not going to get it any better given the limited tools that I have available in my garage workshop. I'll post a full write-up when it's done.