Essentially the D20 Modern game https://www.fantasygrounds.com/store....php?id=DGA054 was D&D3/3.5/Pathfinder ruleset with an alternate Players Handbook and campaign source material.
Please consider re-writing the module to be a source book for the 3.5/Pathfinder ruleset. The current module has not been updated in years and is in need of maintenance/errata fixes.
- Robert