If you go to this link at powersports pro Honda, it seems that you can order a brand new CT-K3 frame for 350.00 bucks, painted and all! http://www.powersportspro.com/pages/parts/viewbybrand/7/Honda.aspx
If anyone is interested in purchasing one of these frames one thing to consider is what you are going to do for a vin #. I ran into this on another project where Honda had changed the frame out on a warranty issue but the new frame did not have no #'s.They would not transfer the old # or give me the old frame.Just something to think about.
If you have a title to the old frame, you should have no issues.
Take the old frame title and go to your local state police office and explain what you want to do. They will have a procedure for this as it is what would have to be done if the bike were rebuilt by a Honda shop after a wreck. You MAY and up with a "rebuilt" or "salvage" type of title, though your state may be different.
You also may end up with a state issued VIN which will be non-standard, but will be perfectly legal. I believe in Cali, you can get a VIN transferred to a new frame, but I do not know the procedure.
If you just get the frame, and re-number it with the old number, I suspect that is some sort of crime in most every state. If you hae a legal title and need to do this, get it done right or you run some severe risks including losing the bike, criminal charges, etc. etc.
If you do inquire, post the results of your state so others can benefit!