I like it. Marc cefalo had something like that in an ITR s2000. I don't think it presents an obstacle to exit at all recognizing you will trim down the post.

I have to run 150 pounds in my 968 and made a bunch of holes in the floor to double bolt my weight and wish I had come up with a product like yours. Plus I am always changing weight based on the wheels I run or the scales at different tracks being up to 40 pounds different.

The strength of using the factory seat mounts will be superior to drilling the floor.