Oh dont get me wrong,i completely agree,they definitely should have went glass,as for the capacity i think they were going for a smaller profile than like the foggers,but yeah the capacity definitely suffers because of that,the dual coils suck the juice down,but it's not too bad,a tank full gets me through half the day,then fill it up and it's good to go for the second half.
I haven't got it done yet,the kit came in today,so i am sending it out to another member in California tommorow morning.He is going to cut it,and will send some pictures mounted on his orchid before he sends it back,so i'll throw up a pic once i get it.I think it should add about 1-1.5ml at least,looking at it,it can be a bit over 1/4" taller than the stock tank,possibly even 3/8" more,but just guessing on the amount of added capacity since the stock tank has the buldge and the glass doesn't.I'll keep info posted on it though,as long as it makes it enough to be worthwhile,i will then pass the other members info along,maybe people interested could get the kit and send them off to him,or he may possibly pick a few up to offer up to interested people.