Don could make the Hogan intake project pretty easy for anybody to tackle (if the $$ are there).
1) Don provides a drawing of the port layout to Hogan.
2) Don provides the spacing across the engine for (2) opposing heads on a standard deck height engine. Something like the dimension from the RH port floor entrance to the LH port floor entrance, for instance. The customer can then advise Hogan if they are using a different deck height, what intake gasket thickness, head gasket thickness, etc. and a compensation can be easily made.
3) Don or the customer reminds Hogan of the standard offset of the LH bank to the RH bank.
4) The customer specifies the carburetor/EFI/nitrous bung/water crossover combination that they want and the height allowable under the hood of the particular application.
Hogan builds an intake to their standard price list. They have some sort of really good fabrication fixture that does not require them to have an assembled engine. All they need is the data described above. This is exactly how we had the Boss Bird blower intake built.......prior to having finished heads in our hands.
As far as headers go, Don could provide a .dxf file of the port layout and the flanges can be waterjet cut. The Boss Bird header flanges (3/8" thick 4130 steel) were $75 each and took one day to make. Then it's off to your favorite header fabricator.
Hope this helps,
Eric