My opinion is "That looks great".

Of course, it's better to use grid for a playin map... Specially if this map shows a dwarven hold... What is more stubboren than a dwarf ? 'perhaps TWO dwarven)
So square and symetrical architure is (AMHA) to me the best way to show their culture straightness.

I also like the octogonal rooms wich give a clockwork look to all the stronghold.

Finally, as others mentionned, used the fan creation of dundjinni... Check these on their forum... There a lot to load and full to fill...

Hope to see the next step...