As last time, this one is a quarter of an inch shorter than the final one. The plaster bottom will be poured up to the edge of this. Once sceniced with dirt and dark spray paint, the final fascia will be glued to it and extend a quarter of an inch higher, this will support the level of the resin pour.
I screwed up this time and put the smooth side out, I hope that doesn't hurt my chances of a good glue joint between the two pieces.