IIRC the first release was the P-40E to B variant conversion for the Revell P-40E kit. The worst Scratchbuilder's kit and the last kit produced was the Bf-109A/B/C/D kit. The '109 experts tore into it right away so not many sold. Very sparse on details and the Jumo engine was too short. The kit was based on the old Hasegawa Bf-109E-4 kit and at least corrected its accuracy defects. I bought two and now work on them on and off over the years and both are almost done. These models are very kit bashed to say the least and have provided a scratch building education. They are almost modeling hacks. When the Meteor Productions produced the early '109 conversion sets for the Hasegawa kit mentioned above, I graphed these on the the Scratch Builders kits. The two models look pretty good with the new engine custom cockpits and all the other more modern AM added on. Do not ask me what this all cost. This is part of my version of modeler's affliction. I keep some of the dogs.