Are there difference between skrimish constum maps and costum campaign cities?

[Fable]

I know custom settlements are EXTREMELY hard to do... But one thing I don't understand is this:
This map maker has created a pretty good Helms Deep, using vanilla materials:

http://www.twcenter.net/forums/showthread.php?t=277430

Could such maps not be implemented in a campaign?

They don't seem such difficult to make(if you're using vanilla objects)?
And in 1.4 Minas tirith is reskinned? You could make a rather nice looking costum citadel just by Vanilla, and then give them a reskin?

Or am I misunderstanding somthing completely?

[MasterBigAb]

I know custom settlements are EXTREMELY hard to do... But one thing I don't understand is this:
This map maker has created a pretty good Helms Deep, using vanilla materials:

http://www.twcenter.net/forums/showthread.php?t=277430

Could such maps not be implemented in a campaign?

They don't seem such difficult to make(if you're using vanilla objects)?
And in 1.4 Minas tirith is reskinned? You could make a rather nice looking costum citadel just by Vanilla, and then give them a reskin?

Or am I misunderstanding somthing completely?

If i remember correctly KK said it is sadly not possible to insert this for the campaign into the map...

[Beorn]

It's possible, but not for cities/castles

[Kovas]

It's possible, but not for cities/castles

If it's not possible for cities or castles, for what it's possible? Forts?

[BlackViper]

If it's not possible for cities or castles, for what it's possible? Forts?

Normal terrains I think.

[Beorn]

If it's not possible for cities or castles, for what it's possible? Forts?

Both forts and normal terrains.