Sorry Champstarr I do not have foggiest idea about RMK-Models.
I have never ordered any combat plane. Since day one I have build all my combat planes by myself. Totally I think that I have built about 200 planes of 30 different types.
But anyway Stein models are sold By
http://www.havelaircraft.cz/Modely-WW-II-1-12
I do not know how reliable or fast they are to deliver, but they have been around some years. I noticed that they have little strange dialect there, but I think that you can e-mail them in English
Old Erkki