This is EXACTLY what I wanted to do on my own!!!
Shouldn't take that long (a few hours at most actually).
Civ4+Warlord+BtS = BtS, or am I missing something ?
Varietas Delectat mod + Varietas Delectat Modern Era Expansion already go together, so no effort required here
Blue Marble can be installed in CustomAssets and then should work with all of the above out of the box (I know it does for my mod which in turn is very similar to VD + MEE). Alternatively, just delete CustomAssets, install Blue Marble and copy the Art dir of CustomAssets into the VD Art dir. There, again, no effort required.
BUG mod took me about an hour or two to include in my mod (only out of curiosity, not part of the version which is available for download). Takes all of 10 minutes if you know what to do, but I needed to figure that out first
So unless I miss something with Civ4+Warlord+BtS, it should take at most 1 hour to combine the above mods, assuming you know what you are doing. Maybe up to 4 if you don't (but have some modding experience)