I would do pretty much the same as Terry, with a few additions:
- shoot HP5 at 250
- meter the darkest shadows of the interior, particularly the very dark door (I think) in the back wall and place that on Zone III (darkest area with shadow detail)
- meter the white front and see where it falls and develop accordingly, bringing it down a little if it is into Zone IX
As for developer and time, normally you have to do some tests in advance in order to control contrast.
We will want to see the final print!