Its a 30ft rib with a Kad300 in her and is used as an egsample only.At standstill she is down by the stern bye 4 inches up the tube.She has a lot of weight forward,So imagine what it would be like withought the forward weight or Cabin.She will not look right .UnTill you gun here.And Im no expert or even a DIY person , this is a Generated as a predicted hull model with weights, to see what she would in theory float like if it were built.Which it will never be as she will never conform to the New leisure craft RCD cat B offshore stability tests requirments for leisure craft.
I am aware that RCD is not important to you.But its for refrence only and food for thought,as with all the other stuff your thinking about.
Good luck you may find this an alternative to a fag packet see http://www.formsys.com/Maxsurf/MSPro...RHydromax.html
Know be fair dont you think specilist advice maybe needed before you cut any holes in her at this stage of your project.Or consult with JK or AP they have done it with a rib.
Good luck anyway.