A handheld pressurized garden sprayer (OSH, probably about $30) and some Dawn dishwashing detergent should help you locate the leaks pretty quickly. Also removes any excess dirt, oil, and grease if you scrub it a bit.
As to flooring, I've seen a one piece aluminum diamond plate floor made to replace the three rectangular back sections (on a 16' Bombard SIB), but based on the results, I wouldn't wish that on anyone.
Luck;
jky