it took me friday, sat, sunday, in the summer so drying wasnt too much of a prob to protectocote the van bed. it took me ages to wait for all the parts to come so i put the tank in 1st coz a 400ltr tank takes alot of room up in your garden. then waited for the rest to come. once the tank was in i wanted to ply around it to protect it so theres another 2days. parts came one by one. i had hell of trouble finding an IBC container close enough to collect. there was problem after problem. i still have slip ups now but thats normaly because i keep leaving the sub pump on while i'm eating breckfast and fill the van with pure h2o.lol
i'm not saying all diy systems go this way but mine did and i would most defantly go pro nxt time.
also i've got about 50 recepts to put through my books at the end of the year where as if i'd of got a pro system i'd one and now worry about the tax man rejecting any due to me buying half the stuff from b&q