That case reminds me of a Roadster I saw in Life's about 7 years ago. The owner had a custom made coachbuilt box for his wif3's wheelchair. It could be removed to leave the rack exposed.
I also seem to remember a 4-seater being converted by rear seat removal to leave a large storage area. It might have had a clamshell type solid cover. Last year while at Williams I mentioned it to another owner there who had a 4-seater. He said he'd talk to Williams about a conversion.
