I'll be interested to see how you get on with the trim. For my Abbot I'm using a standard medium-weight upholstery foam, but taking care to wrap the Trakmark round the underside so it can't peel away like the original. I'm using Evostick Impact adhesive, but not in its impact mode. Getting the holes right is a real pain, and the more dimensionally stable the foam is, the better. This is the first panel I did, I like to think I'm improving!
Andy