Decisions for a bike rack

I don't think I want to go the roof rack route or the hitch mount.... So I have considered trunk rack mounts:

Saris Bones, Thule Passage and Yakima Super Joe....

Then I was just thinking of cutting a piece of wood to fit snuggly across the rear trunk area and bolting a couple fork mounts and maybe a couple of wheel holders. Most of my riding requires a short transport to meet a group or a friend, so I can sacrifice the interior space. If anyone has a recommendations for how to set this up, I would appreciate it.

I am quite particular and do not want to use a trunk mount rack unless I know it will not damage the finish of my vehicle.