@Paroxysm could probably give a few good tips, imo the whole thing is bound to kinda be a disappointment unless your expectations aren't that great (no, a simple diy project won't have anywhere near decent yields). As far as the actual cell goes, I would opt for the "traditional" mutli-plate one, you can probably find a shitfuckton of diy guides online. Storage shouldn't be an issue, if you can just force it into a high pressure tank