If your trying to bare metal it again 3M paint removal discs in a drill are pretty fast for the open areas.

https://www.3m.com/3M/en_US/p/d/b40070710/

Tight spots can be done with sticky back 80-120 grit on wood paint stir sticks or popsicle sticks. Having a Dremel tool with the right bits is also handy to dig paint out of corners and seams.