If you used the search, you'd see I posed this question a few weeks ago and the response was that will all told you wouldn't really save much$. I could fabricate them too, but I haven't added all the pieces, cost and time together to make a judgement call. I'll be watching responses here too, but my thread died, so we'll see.
Otherwise the only way I see it being done is getting hold of a good one (PRJ) and copying it then seeing the cost.
Good Luck!