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I'd like to ask for the help of those who've done it before, fiberglass molding & tooling.

The stuff I have done is very small models, so there isn't much trouble with time. This if for a pair of fenders with skirts connecting them to the tapered nose-piece. I have bought a pair of steel fenders which do look just fine, but adding the skirt is a problem.

So I will consider the first idea, which is take an inner tube of the right size and blow it up. Now you have the shape I want, then bury half of the inflated tube into a hardening mix to get the female mold. Here is where the details get harder and I need some help.

1) Is that the edges of the fender should I believe, be established first, instead of trying to shape them out of a ragged edge. I'm not sure how to do this and if it is the right way to go.

2) On the inner edge of each fender (and this is why the ready-made steel doesn't work), the material is vertical more-or-less and it needs to transition smoothly to horizontal, extending to the center body part. Look at a few classics from the Twenties and you know what I mean.

So I need an appropriate shape box to mold it in with access to make that curved transition.

If anyone has any ideas about how to accomplish this, I'm waiting to hear. I already have tried and tested the inner tube and it works beautifully to give me the shape I want.