Two Hatch Questions

I have been tweaking the hatch on my 8-ft Cubby for two days now, and I just about have it as good as I can get it...not perfect, but fairly good.
Question No. 1: I want to put two "star wheel" hatch supports in, but am uncertain how long they should be...I see Austin Hardware has them in various lengths. Any recommendations?
Question No. 2: I want to install two side pull latches to securely hold the hatch tight when in transit...again, what model (and source) do you suggest?
Progress Report: I have the cabinetry about 90% done...have hinges and knobs from Rockkler on hand, and have begun staining the oak. I have all the insulation done, and could begin skinning with aluminum if I had it...have not gone to the big city to get it yet. All interior wood work/walls/cabinets/ trim, etc, is done. Have not even thought much about the doors yet..not anxious for them...I suspect they might be a bigger pain than the hatch.
Thanks for your suggestions.
John at Salida, CO
Question No. 1: I want to put two "star wheel" hatch supports in, but am uncertain how long they should be...I see Austin Hardware has them in various lengths. Any recommendations?
Question No. 2: I want to install two side pull latches to securely hold the hatch tight when in transit...again, what model (and source) do you suggest?
Progress Report: I have the cabinetry about 90% done...have hinges and knobs from Rockkler on hand, and have begun staining the oak. I have all the insulation done, and could begin skinning with aluminum if I had it...have not gone to the big city to get it yet. All interior wood work/walls/cabinets/ trim, etc, is done. Have not even thought much about the doors yet..not anxious for them...I suspect they might be a bigger pain than the hatch.
Thanks for your suggestions.
John at Salida, CO