AH, Daughters boyfriends are a great resource !!!
Just like on the sitcom Last Man Standing with Tim Allen, he has chores when he comes over
Helped pull the stock mattress out and put the HEAVY foam 72x80 mattress in...
Actually was worried when I first measured as it looked too long, and too tall,
but the stock mattress is rigid on the edges and the foam is well, foam
so worked out well and it's corners are rounded so a bit more space around the foot !!