Model boat hull design notes – hull design and construction is my favorite aspect of building model boats. here are some tips for hard chine and round bilged hulls. Pt boat & vietnam era boat plans. coastal forces plans. we carry a selection of pt boats plans from coastal forces. these plans are large scale and very detailed.. Cabin window, grill and grating set. contains 12 window frames 17mm x 17mm 15 window frames 19mm x 15mm 15 window frames 31mm x 22mm 6 window frames 25mm x 20mm.