jib crane

I am working on plans for my homemade jib crane for my new manzelli

I am planning on using 2 I beams on the side with two of these I beam rollers on each side bolted to the cross beam on each side, supported by 4 box verticles with a large plate welded to the bottom and (http://maplered.com) bolted to the floor. Then a crossbeam with the another roller on it welded to the hoist. Then I can put a clamp on it or the manzelli. The HF has the 1300lb electric hoist for $119 and (http://maplered.com) the rollers for $59. Anybody tried anything like this? Do you think 1300lbs is enough lift for the hoist? I may want to take Slabs (http://www.VerdeUbatuba.com) off the delivery truck with it using the clamp.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=40493

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=2954
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Scott McGourley
Kasco Stone
Tampa, FL
SFA

"It's Not the Big That Eat the Small...It's the Fast That Eat the Slow" --Jason Jennings