Dorlavian/Perseid Architecture ideas
Nice ideas. If you don't mind me drifting from just government architecture for a moment, I think another factor to take into account is definitely religious/cultural beliefs. For example, the Dorvalians (Perseids) religion is a six god polytheistic faith. If a GM wanted to extrapolate from that, one could have many major building designs be hexagons. The number six might feature promiently in patterns.
One could reverse that, of course, and say that because of the sacredness hex designs would be used only for places of worship, but even that choice would shape the building plans.
Sticking with the Dorlavians for a moment, one should also take racial strengths into account. Because the Dorlavians have natural sight flash defense and energy resistance, a GM could also incorporate that. Imagine chambers of high polished almost blindling (to non Perseid) crystal where the Dorlavans come to relax or meditate. After all, Perseid mating cycles are triggered during the darker fall season... a dimly lit building might be the same as hanging out a red lantern. Bound to get you worked up.
For that matter, imagine walls with very low level currents of energy cruising through them. Other races might risk getting burned or shocked, but Perseid would just run hands over the surfaces enjoying that 'tingling' sensation. Devious Dorvalan designers might even use this as a subtle (or not subtle) way of discouraging non-Perseid from wandering too deep into complexes restricted to "authorized personel".
Couple that with the art of Etch Sketching on soft materials (no doubt, many of which could harden quickly after the work is done) and you have some very unusal architecture indeed.