I don't use "DeltaCAD", I use "TurboCAD". Which is probably about the same
thing. New CD's of a recent version can be had on EBay for $10 or so.

Not only is it better than manual CAD, I can take a DXF file to Kinkos and
print it out full size. I printed out a side view of my MoHawk tube and
fabric fuselage (16 feet long, all one piece of paper), then just stapled it
to my workbench and welded tube over the top of it. A really easy way of
getting things exact.

I did a drawing of a back plate of a home made PSRU. Did it full size, with
each of the holes to be drilled marked by a dot. Glued the paper to the
aluminum plate, and started drilling and cutting. Again it was easy, and the
holes are within a few thousandths of perfect.