I havn't seen the conversion kit offered anywhere in awhile, but I havn't been looking for it either. I got mine from KCLANK about a year ago. So I'm not really sure where you could find one. I got the main gun mounted tonight. I mounted a HL recoil unit to the gun. It's mounted backwards so it should snap back and slowly travel forward. I can't remember who posted this before but I know someone posted mounting the barrel backwards was the easiest way to "fix" the recoil. I used some tubing from the hardware store to lengthen the kit's barrel to fit into the recoil unit. I had orginally glued the superstructure to the hull but removed it and added plywood mounts at the four corners. The superstructure is now held in place by 4-40 bolts with blind nuts. This will allow for easier access amd maintenance. I also prefer the version without the commander's cupola, but I am building this to the wife's specs. So it will be the command version.