To assemble cut the foam to size and apply it to the bottom of the case where there are groves. You only need to apply the gasket foam to the bottom case not the top.
When putting the macropad together it is keyed so it should only be able to go together one way. If the sides are not flush then try flipping it around.
On the plate the side where the tab has a part cut out of it is the front.
This is my first attempt making anything like this so I hope to improve on this in the future
For this macropad you will need:
1/16 in thick Neoprene foam: https://www.amazon.com/dp/B06ZZDMHGX?psc=1&ref=ppx_yo2ov_dt_b_product_details
4 m3*12 screws: https://www.amazon.com/dp/B0714FLXND?ref=ppx_yo2ov_dt_b_product_details&th=1
The author marked this model as their own original creation.