Phil... there are about fifty posts about stainless bolts, the most recent as of a couple of days ago. If you search the forum, you'll find ample places to purchase these as well as the stainless or galvanized cradle... I don't believe anyone on here has any homegrown kits left. There's a wealth of info if you search.
Now that is a big trunk. It holds a tuba, a suitcase, a dead dog, and a garment bag almost perfectly.