Like many in our group I design and build stuff that may or might not be a good idea...
I left jugs of water out in the cold and stuck the ice in the refrigerator and the stuff in the freezer melted (the ice was not colder than the ice cream so there was no point in adding ice there)
This is plan B. ...
Step 1: tools
These are the tools I thought I would need: a tape measure, straight edge, square, felt marker, long knife or probe, a saw, I used circular saw with an abrasive blade.
I would have used a table saw with a fence or a hot wire cutter.
Other saws are too messy.
even on this scale planning helps