Not sure who built the boats for Billings but I'm pretty sure these IMEX boats (Smit Rotterdam and Prinz Eugen to name a couple) carried by RC Scale Model were built by same factory as who built them for Graupner. I do know Graupner only handles quality products. Don't get me wrong, I wish I had the building talent and time some of you have so I could sink $1500 into 4 kits instead of one RTR boat. I might get better at building but I won't have the time it takes until I retire.