I bought my 17'x 48" Glass drift boat for $2500, on a trailer, w/ Sawyer oars, including a spare, anchor & system, rod holders, pretty much complete. Granted it is an older boat, but it was in real good shape.
I put coat it on the bottom, re-mounted the rod holders, put in a pretty good heater, re-worked the anchor system, re-packed the trailer bearings, and re-wired the trailer, and installed sliding/swivel seats. All for around $500 or less. Then again, I have a fairly complete wood shop, and I was able to do a lot with scrap materials, and used a lot of my own time.
So the tab can run up very quickly. It depends on how far you want to go with it. A new trailer will cost $800+. Better oars will run at least $300. Swivel seats would go $80+. Nearly everything you'll need is at Sportco.
My boat has some design flaws however, and I'm sure there are better hulls out there. For what it's worth, a new 16' x 54" Alumaweld pro guide, complete, w/ trailer lists at $5995+/-.
What does the guy intend to do with his molds??
Just food for thought.