The idea for the moment is basically to make a similar version to some of the more common ones on the market, i can easily fabricate up a stainless steel box or can and tig weld it up, all im stuck with really is the drain, the idea i have at the moment would be to weld a 16mm stainless nut on to the bottom of the box, then stick a small bolt through it with a o seal, would just mean i'ld have to remove it from the car to empty it every time. also the baffling, how long does the wire wool last? i should imagine i'll be able to poke some up through the drain (can make it a 24mm if worst comes to worst). I'll work out the positioning for the can after i have everything else sorted then make myself a little bracket to bolt around the firewall somewhere (similar to the post in the stickies, some people do read them ) One last thing, what kind of volume should i be making it? i have 0 experience with these things so no idea how quick they fill up Also when i have finished making it i'll post all the drawings up here and some step by step photos.