The only thing that i can complain about is the acrylic tube, at this time. I have the OTW made for my 1/12th scale 32nd parallel USS Holland but haven't installed it yet. I bought it from a friend but when it arrived the tube was shattered. I'm planning to exchange the acrylic tube for a polycarbonate. I am going to use 3/8" wall aluminum tube for the ballast tank section with the polycarbonate tubes on each end of it. This will allow me to drill several 3/32" chase bores through the wall of the aluminum ballast tank for the wiring that is now chased through the center tube of the ballast tank. The WTC tube will be 5" diameter. The ballast capacity will be 1000ml.
I have a really unusual way to compress the WTC tubes for a high-pressure seal. I will be applying for a patent and will post images soon. My wife is a patent specialist paralegal, so this should be simple.
32nd Parallel 1/12th scale U.S.S Holland
Scale Shipyard 1/48th scale Type IX
Alexander Engel 1/48th scale Gato
"Anything one man can imagine, other men can make real." — Jules Verne