914-6 Oil Tank Tricks, trying to decide how to do oil tank in 914-6 Options

[worn]

OK, first you should know that in years past I was cheap enough to make my own gravel with a sledge hammer, so bear with me.

I have been looking at the about $1200+ price tag on the standard fender 914-6 oil tank for my 3.2 914-6 conversion. I know the sensible thing to do, but it is hard to take so here are my thoughts.

First, I like the under car fan set-up, so I don't plan to run lines all of the way to the nose. I want the trunk, and the cooling air is easiest blown down through the floor, which seems the wrong place for it. I am interested in how that Setrab fan cooler has worked out for people, but that is my idea so far.

I want the oil tank in the normal location for good gravity feed to the pump. On the other hand a filler neck is easy to obtain and the oil filter pedestal can be from Summit or Jegs and still sit in the normal place, screwed onto the fender, or it could be more conveniently located. It just wouldn't be welded into the tank. Which brings up simply welding a tank from aluminum to fit the space and then putting in lines for the oil in and out, the filler neck and vent lines. How stupid is this in real terms? My biggest concern is making perfectly clean welds to avoid getting anything into the engine. It cannot be impossible because it is done, but it may be impossible for me to do it. Half the fun for me is in the construction, and I could use the savings to justify another welder.

Thanks for any pointers.