Dollarbill,
I am not sure how the cb750 stock wheel would fit in those forks. I have always liked the look of mags. I was looking at Squirley's build though and he seems to have done it without much trouble.
Included in the kit is the stem and spacer essentially. The lower triple could also be included if you sent it to me (a core). It all depends on what forks you want to run (inverted, standard, off what bike etc.). If you want USD forks, I have a triple here that we could use.
It takes about 3 hours to machine the stem and spacer, plus the cost of material. It will probably cost around $200.00. If I get more than a few orders, the process will be standardized and they'll cost about $150.00. If a lot of orders for this sort of thing start coming in, the cost would again come down even more; to say $100.00. The best bet for anyone I think is to try and get a "group buy" together, as it would be substantially cheaper.
I don't know what funjimmy's kit is, or how much he charges, but I am confident that this is the safest, most simple, and hopefully most economical way of getting a front end that is a precision fit. Just as if it came from the factory.