So, no one will probably see this, except perhaps in the archives.
The Portal Carrier Concept:
Using the unprecedented possibilities represented by SLINT's control of Portal technology, some of the considerations fundamental to realistic space warfare either are abandoned or altered to the point where they are no longer recognizable.
For example, the coolant systems needed to either store heat or radiate it away can now be tied to a planet-based cooling facility to dump heat when needed. There are still considerations of heat and long-range detection via thermal signatures in relation to the drive systems, but the combat considerations are effectively moot.
The same goes for mass considerations in relations to fuel and ammunition for kinetic-kill weapons and missiles. Portals to planet-side or planet-orbit staging areas allow for 2-way movement of war material to and from the zone of conflict. The portal carrier in space warfare has the advantage of being able to effectively carry a weapon payload (drones and missiles, as well as increased Rate-of-Fire for laser PD platforms) far in excess of what it's size and drive system should be able to handle.
Now, when we can build an airship equipped with a combat portable portal for atmospheric use, then we will have Protoss carriers (essentially a mobile airfield for the fielding of short-range UCAVs and fighters, and anything else that can fit through the portal such as troop transports). When they are grounded, they can be used to quickly build a field base by moving supplies and ground vehicles, as well as personnel, from a central staging area.
I think I have sufficiently explained my position to show that, while снайпер has brought up many valid points concerning space warfare, he is not "Thinking with Portals"®.