Not my kind of thing, but since nobody else has answered... I would just draw it up. It is always useful to have the diemensions of some stock parts like BBs and head tubes. Then just use a 1.125 straightedge to draw in all the tubes, or do it in cad. Once you have the main triangle, and you can copy one of your forks (actually that is backwards, you need to know the fork and headset height to place the head tube), wheels and so forth, it is easy to see whether there are any odd angles you can't lug. It takes a little time to get set up, but once you have a few parts either in your CAD or in your drawing kit, you are ready to make any drawing you want in a few minutes. By hand, get a BB, they are only a few bucks, then a tube/straightedge as mentioned above, and another one the size of the head tubes you use. With those you can make a plan for any frame you want. Every time I get a new part, I take the time to CAD it for my files, then I can insert the "real" parts in my drawings. But for a full size plan you really only need to know the main triangle tube position, and the locations of key parts. The shape of the chain stay, say, is not important for the drawing, though it doesn't hurt to have it. But most folks work those parts to fit rather than strictly taking them off the drawing.
Other ideas are to go to FF and ask there, only be real careful what you say since they tend to jump on folks who ask this kind of thing if they figure they don't deserve to build it and might kill someone.
The Paternek vids include construction of one really small frame, can't remember whether it was the lug or fillet tape. I think it was the lug. But you could ask Tim, and order that tape. Also you can ask Pacenti, Henry James, and probably Nova, and they will put together what you need for the size you want. They can tell you if it is doable.
Sounds like your frame is close enough and the changes minor enough you ought to be able to eyeball it.