you all went towards a locomotor research but perhaps i have an idea for Roani52's initial question.
How to use two buildings as a teleport/wormhole shortcut between them.
Perhaps it is possible to modify the Tunnel behavior. As far as i remember do units move much smoother while they are in the tunnel. Perhaps they use a new movement system that can be modified to speed up units in the tunnel to a speed of 100.
Oh yeah, here i found something interesting.
In the rules.ini is an entry [Tunnel] that specifies the unit speed for Foot,Track,Wheel,Hover etc.
If you change the values to 1000% or even 10000% they should move really fast.
Perhaps you can combine now a building with the tunnel logic. Or at least make a map in which a tunnel looks like a special building (Stargate

).