Md,
You don't need to spend all that $$$'s on that fancy Harkin Downhaul system ... and you'll need to modify it anyway. You can re-use what you have and only need to buy half the parts. As I offered above, I can come by and discuss w/ you some ideas that will save you some $$$$$'s .... I believe you have my E-Mail address (it's in my profile also) or send me a PM here on the forum.
And please plan on coming/attending the Gunpowder Regatta (May 4-5th) and RHYC (June 20th-21st) ... and we'll get you "started" (Ha, Ha, Ha ... there's a joke in there)
Harry