Custom Town Halls upgrading properly

I am making new races in a map, and made custom buildings using the Great Hall/Stronghold/Fortress, but when they upgrade, they turn into the regular unit, not my custom one. I know that you can use custom ones because the Corrupted Tree of Life can do that, and uses the same upgrade ability as the regular Tree of Life. I already have a working workaround with triggers, but would like to know if anyone knows how to make a unit upgrade properly.

I need this question answer also.

They change into the normal one because that ability just says: change into this unit, that unit being the next in line for upgrade. It's a pre-programmed ability, as of yet we cannot change abilities. So to do your customs properly just change the things you want on the original unit instead of making the custom unit.

I did some more research, and found that to be pretty much correct; the upgrade ability isn't even in the AbilityData.slk, and I'm not editing the .slk for this anyway. I had thought that the ability "Tree of Life upgrade ability" (which is shared by the normal Tree of Life series and the Corrupted Tree of Life series) had something to do with it. Anyway, someone else wanted to know how to do this, and my trigger workaround works just as well:
Event:
Unit - A unit owned by Player 1 Finishes an upgrade
Unit - A unit owned by Player 2 Finishes an upgrade
... for every player that needs to have it.
Conditions
Unit type of (Triggering unit) equal to Stronghold
(Check whether or not the player should get the custom stronghold here)
Actions
Unit - Replace Triggering unit with a Custom Stronghold using the old unit's relative life and mana

And do the the same for Fortress, and substiture the right names... yadayada. You can even add more upgrades by converting a Fortress to, say a custom Tree of Life and upgrading that and so on...

And as forTo do my custom properly, I need to leave the original races intact, as they will still be used. I'm adding 7 races to the 4 already there, and allowing the players use any.

A better way to do this is to detect the "order to stronghold", which is what actually happens, and change it to "order to custom stronghold", but you would have to determine the custom name (such as custom_oC11) that your unit has, I believe. I haven't tried this, and I can think of some problems, but it shouldn't be too hard.

In the end, however, I have decided to use the normal Stronghold series, just using animation triggers to change how they look, and triggers turn all their peons into regular ones. The reason for this is that I was using the same base unit anyway, and this makes it much easier on the CPU to meet upgrade requirements (I was previously making temporary units to qualify players for upgrades).

One final BS: If anyone else is working on adding new races without modifying files, and think that their ideas are more than just making creeps trainable (ie new spells, new unit dynamics, radically different tech trees), post here or PM me or something and maybe we could combine our projects.

Thanks, OS. I find that your trigger solution works well enough for me!

I've had problems with this as well.

I'd make a custom from the Castle, and then in the editor and the game it'd appear as a Town Hall. Bleh.

Unfortunately I haven't done tests with this, but I am currently using a custom Castle that looks like a Town Hall in the editor, but builds into a Castle in the game.

I don't know what I did to get this to work, but when I find out I'll try and remember to post.

Care.