looks fantastic and your idea of fuel tank off a semi has me thinking as I have a highway tractor wrecking yard very close by.Been down this rabbit hole. Started with two 55 gallon steel drums that started to form surface rust inside. Switched to white plastic drums and had one crack on me. Fortunately it cracked above the fuel level. After that I found a 100 gallon aluminum tank off a Freighliner truck at the salvage yard. I think I paid $80 for it.
I have a $65 eBay 12V pump, hose, nozzle setup. Last year I bought a auto shutoff nozzle for another $30 and added a goldenrod filter. Plumbed it with PVC pipe.
I have a local delivery company fill it and still pay a little less than on road pump price.
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one comment though.... I was told once PVC for pure diesel is no problems. But for biodiesel blends due to the solvent used in the bio diesel it softens some types of rubbers and pvc fairly quickly.
For sure I am no expert just something I was told once. Maybe something to research?