The provided sketch is helpful, but currently, custom spin weld fitting installations are on hold as our custom builder tool is not yet complete. You can order the Alpha 930BLANK fresh water tank along with the required fittings — 1.5", 3/4", and 1/2" threaded fittings — and four level sensors with threaded studs for self-installation or local service center installation. We also offer a Universal Fresh Water Tank Fittings Kit that includes the most commonly used fittings and sensors. Here are the links to the products: Alpha 930BLANK tank and Universal Fittings Kit. Once you confirm which parts you want, we will provide the exact part numbers for your purchase cart.