First I measured and marked my blank, it's 24"x24"x3/4" ridged pink foam from Home Depot

Next I cut out two for the front and back

I took the scraps and made sides and top and sanded it all to shape, then I filled all the gaps with drywall compound, I should have filled the bigger gaps with hot glue or foam board glue, or liquid nails, but I didnt and I filled them in with the drywall compound. Unfortunately I didnt get pics of this stage.
heres a pic fitted together and pre drywall compound

Here it is with the drywall compound on, after it drys I will sand it all smooth

Next I will print up and trace out the epitaph and cut that out.......not sure where I'll go with design after that, no real plan here
