Nice bay

Does that cam sensor have its connector laying flat ? if so, whats it off as I could do with one.

Based on the MKII escort designs trying to exit air though the boot lid would be bad, through the rear panel would be good - more so with a lip spoiler on the rearmost boot edge.

There is a great book by Simon Mc Beath (sp ?) that has loads of good info and diagrams on air flow and air pressures - DT sell it but it is printed by Haynes