Thanks. Dry sump systems need not cost a fortune if you are able to fabricate some of the components. I am using a belt driven single stage pump from Stock Car Products in the USA as a scavenge which was an okay price back when I bought it with a strong $Aus. Another method often used is a pump from a bigger engine, like a Falcon, in a custom housing bolted to a plate welded onto the front of the timing cover with the pump shaft driven off the front of the cam. A single stage scavenge is all that is needed for a k engine and then just use the pressure pump as I have done.
With the tank, I know the limits of my welding and so had one custom made. It was actually done in the UK which a year or so ago was as cheap as anything I could get here and very easily arranged. I am sure though that it would be straight forward and not expensive to have one fabricated here as they are not complicated and just require some skilful tig welding.