Building a grow cabinet.

[maxsuperdanks]

Compost can cause problems (most notably pests) indoors.
Ashes change the pH of the soil and make it sticky and hard to work with.
Fishing worms and compost worms are not the same, and a source of disease-free worm castings (=commercially packaged) is safer indoors.
Peat moss has a VERY low pH and needs to be limed.
Sand isn't desirable. Go with extra perlite.
Raw sawdust leads to nitrogen problems.
Coffee cans are going to release iron oxide into the soil and lock out other nutrients. Never use metal in an indoor grow.

See, this is the kind of shit I need to know. Thank you very much for this wealth of information.