I do not think that the hull is big enough for any standard WTC. I am going to try and rc this guy some time after Christmas. The max outer diameter by my rough estimates should be around 1.9" I think that 1.5"pvc would fit inside and then using a custom air bladder on top you could make a static diver. I already have the speed controller, the motor, and the airpumps. Now I just need time. If you have any thoughts that you would like to mull over let me know. I ma just in the thinking stage. I do not think that it should be all too hard, but challenging. I am nost concerned about the tail connections, but after the kit becomes available here in the states, I will get one and see what needs to be done to do it. I want to have a small modern sub o be able to take around with me when I travel. I think that this will make a good candidate.