Well, I found a square container the size I wanted. It is a Tupperware type and if my DW does not find out, I will be in good shape. I followed the same procedure as the round one and it produces a 2″ X 2″ X 2″ soil block with a divot.
.My mix of 50/50 fine compost and fine vermiculite + 1/2 cup of dried blood per cubic ft of mix seem to be holding together well
Now if I can get the rest of my apple trees pruned, I will be able to start planting seeds in about 2-3 weeks.