I am fitting the enclosure for the main wheel wells and am having a difficult time making it fit like it is supposed to according to the manual. This is the great honkin fiberglass molding that looks like two bucket seats welded together that is underneath the baggage compartment and that buts up against the 172 bulkhead.. I am beginning to think that my molding is warped but I can’t tell. My question is whether the forward facing face of the molding is supposed to be a flat surface (like a bulkhead) or is it supposed to be concave. Mine is pronouncedly concave and I am wondering if it just took on this shape from the tension in the molding over left standing for a number of years or whether it is suppose to be like that.  I would be grateful if anyone could tell me. Also if it is supposed to be flat, I would welcome any ideas on how to flatten it. It is a very heavy piece of fiberglass – probably 8 bid. Thanks.