I was wondering if you were able to convert a other race droid and start building another civ's buildings like in starcraft. Then you would be able to have up to 400 hundred troops with 2 different races.

In starcraft(for those that dont know) if you were able to convert say a zerg drone( protoss only had the ability to convert ) you were able to build zerg buildings and troops and have another 200 hundred unit count.

This could cause some major lag since everyone is able to convert units.

I doubt this would happen...though if you consider it. Imps take Wookie castle then start making BERSERKERS!!!!! Now there is a thought. Hadn't considered that one...

In AOK, if monks would convert a barracks of celts or something, they could get the build-speed-bonus those barracks have but not be able to build the unit-types..

Yes but they would have totally different art work in this game...

...which makes it even MORE difficult to do this. You'd have one player controlling two civs. i think it's impossible..