Food for thought...I went with white lexan when replacing my cracked skylight last year...it noticeably cut down on heat transmitted through and lets in MORE than enough light. Love it! I purchased mine from the above posted link (EZ Tops).
I found the hardest part of the job to be standing so long on the ladder rungs during the time consuming butyl tape removal stage. I did some of the work from the roof, but most from a ladder due to my skylight being right on the edge of the roof.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)