Data Sources.....Available??

AllDoes anyone know of source of airplane geometry data short of buying an airplane POH/FM? I am now in a position to continue tweaking a C310R that I have and need to pickup some data points such as Empty Weight CG, Wing length, Chord, etc. I checked at the local airport and there is only one here and the owner has denied access (It's in a private hangar).I have the TCDS from the FAA but it doesn't contain the data-set that I need. I found a POH on the net for $15 but I hate to spend money on a handbook that I could use for payware, upgrades etc when all I need is planform data.Any help will be appreciated.ThanksBobL