I used to glue them on the bottom piece first, but it was recommended to glue the walls and baffles first, then attach the bottom and later the top. It works.
I make it a point to align all the bottom edges perfectly, and if any are a fraction too tall, it will be at the top where it doesn't matter nearly as much. We want it to hold water and not leak, after all.
For me, I prefer to have a clean front panel, so I glue the ends and baffles between the front and back pieces.
The Model M is a good sump for small tanks and small stands. Be sure to use a small return pump, as too much flow will flood the tank with microbubbles.
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