Thank you very much Dave.
That picture answers all my questions. I really appreciated.
By the way I gave Savage a call today. In fact they told me there are no external differences between the 12 VLP repeater and single shot versions. Both have a short action with a standard size port. The only difference is that the single shot version has a solid bottom (as you described and the pic shows) whereas the repeater has a cut-out for the blind magazine. Everything else is the same.
The target action, besides the solid bottom, has a smaller port for extra stiffness. The target action goes on the rifles like the 12 Long Range Precision Varminter and 12 F Class Target rifles. The target action is available in two configurations: RH Boilt - RH Port, or RH Bolt - LH Port. Also the target action has 3 action screws. The standard action has 2.
Thanks again for the info and all the help,
Marc