Plywood tank build info !

[Box car willy]

Iv been reading big plywood tank forms because I wanna start mine in the new year ! Gonna do 16 feet long , four wide and 3 tall , inside ! After basically reading every post on here about plywood tanks I'm thinking 2x4 construction and sealing like the 1700 gallon shark tank , witch is basically fiber tape the hole tank and extra in the seams and epoxy ! iv read alot about the sealing of the wood and that seems to be the biggest problems , leaks ! He was one of the few who filled his up first shot no leaks ! And it seems that when ever someone does have a leak they resort to the tape and epoxy any way ! I'm not trying to put down any ones builds or methods but I'm open for ideas from people who succeeded in building there monster tank , not a 300 or 400 gallon I mean a big tank ! And people who's tanks are still running to this day ! I have lots of fiberglass experience been a red seal bodyman for over 15 years ! I'm not here to save money or time I'm here csuse I don't wanna do it over and over and over ! Let me hear your thoughts thanks !