the landlord will not be attending the pre construction walk through in the morning, so I can stop cleaning this housemost stable install of the PEX engine, publicly found on the web. (my opinion)Install PE (either original PE or PESE)
Run the PE 1.2 patch (just to be safe)
If you have the hard drive space, save a copy of this install (handy for trying even the oldest mods)
Install pex 16.5
Add everything from the last GopticsV4 except
///
settings.ini
and
Gunits.csv
///
That gives you the best example of what the engine can now do.
The alpha testers then add the August files

1 Yes, the result will be that the landscape used will be the one included in the mod. No game crash should occur. AI pathfinding could be effected.
2 PE and PEX is limited by the csv files containing the units wanted by the scenerio. If a unit type is not found in the units csv, a default is used (different for all PE mods). PEX expands on a lot of AI Wings was working on when they were forced to ship the product. The limitations of scenerio scripting are specific to every version of PE.

Limitations

That's a book worth if you include every mod ever made.
3 The short Normandy campaign it the only one with landscape objects that should work properly.
All mods are safe. Unfortunatly, they can cause the PESE mod enabler to cause you problems (there is another book to type lol). The most common is that you can not properly dissable any mod after you have hosted a MP game unless you delete the MPS file from PE's scenerio folder. If the MPS file is also in the pe/mods/modname/modname folders, it will not crash.
Hope that helps