DIY Tackle box / seat

Be gentle with me lads, this is me first one!! Does anybody know where I can find plans to make my own tackle box or tackle box seat? I have recently bought someones gear, who was selling up, it all came in a plastic seat box, but with a huge crack in it. As I'm not a lightweight (6' 6" & 16 1/2 stone) I fancy the idea of making my own. I've done lots of searches on google, etc. but come up empty handed so far! I know the basics of what I want, but don't see the point of re-inventing the wheel if someone has already come up with some plans? Cheers, Ian (newbie!!)

As a starting point you could take a look around B & Q, Homebase etc and see if any water tanks would be suitable as a base - certain seatboxes were made this way not that long ago.

Asda sell a large tool box that i use a tackle box, lots of little compartmnets on the front, large space and trays in side. it costs around ?10. i use it as a seat and i weigh 17+stone.