To answer your questions, I am an orthodontist, thus I have been working with dental materials for over 20 years. In dentistry we cast metal, sculpt, create all kinds of stuff and I have been building models all my life for fun. I make full use of a wide variety of dental materials for my models. The C7R, I did create from nothing. I started with a blob of modeling clay and 3 years later I have a curbside model (no engine of interior). I have put it on the back burner for now, because of some other commitments. I will make a mold and cast in resin...eventually it will have an engine and interior, but that may be years. The C4 LM started 2 years ago. I used the 1/18th GS 1996 as the base. With clay I formed the LM hood and the side skirts. With 3m dental impression material, I made forms and cast them in the same resin I make your retainers with. The interesting thing was finding the best way to bond catalysed resin to the cast metal. Autobody filler binds to both of them, it was the only thing I could find that worked. I grew up in the body shop and have been painting cars all of my life...thus this is really easy for me to do. The most difficult thing to fabricate is wheels. I did some RW wheels from scratch, but I was never happy with them. By chance I saw some Ford SVT wheels that are identical except for the center section. Filled it in and shazam..I have 5 LM's in progress. I am building one of each of the LM's and hope to have them on display this summer. ( that maybe wishful thinking though) I have been making a Callaway Z06R GT3, the first one is almost done and #2 is in progress. #1 goes to my buddy Ernst who built it and #2 goes to the bank roll for my projects ( a Callaway owner with very close ties to the Big Man). My goal one day is to make every model Callaway ever built. I have begun the aerobody prototype, but having some trouble with a few things. This is a tall order I know, but I am still young and once you have made the first one, the next is much faster. I am sorry if I have bored you too much. I have been facinated with the Callaway since I saw my first one in 1987. Never owner one, don't know if I ever will. There is only one Callaway I have ever wanted, but it is out of reach for now.