Let's see now:
Estimated $20 for parts & 4-5 hours even at a minimum wage would be roughly another $32 or so for a combined approximate total of $52.
While I admire the effort and your craftsmanship, I really don't understand why you would not simply buy a manufactured FB similar to this one for only $39 plus shipping:
http://www.midwestsupplies.com/11-sanke-stainless-steel-false-bottom.html
I like building stuff myself, but sometimes it just seems to make more sense to simply buy it off the shelf.
Some things are not ALL about money!...very often its the satisfaction of creating or making your own stuff for free or on the cheap that holds more appeal than opting for the quick and boring option.......DIY is about fun and creativity and the sense of achievement and pride that it brings...looking at some of the posts here it seems some people have more money than sense or time...pity them for being rich boring poor rushed off their feet souls lol!...