I thought I had a more detailed drawing. But alas, I do not. Ideally every rib is the same, and styled in a Harper Goff Victorian shape. This interior is not "Steampunk" in that it is very utilitarian, since Mulvey designed the thing under duress. There will be a lock box under one portal which, when opened, will provide access outside of the vehicle to bring the treasure inside. On the opposite wall, a bunsen burner to heat water for tea.
For though his location may change, a gentleman remains a gentleman.
I will be doing a more detailed drawing tomorrow.
And here it is...