Other than both being produced by Gonzo, SG and Solty Rei don't have too much in common.

The art designer worked on things like Witch Hunter Robin and The Big O, giving it the retro 50's feel (the cars and the buildings).

The CG integration is what reminded me of Bakurestu Tenshi.

It's not the same animation team as SG, just same production company. There's some similar elements, but it resembles the staff's previous work more.