are there any build your own BASS pedals?
i know theres loads for guitar
and im looking specifically for a grind, low Hz ocerdrive srta sound specifically and would love to have one i built myself?
Runoffgroove do the Flipster project. It's basically an Ampeg SB-12 Portaflex built into a pedal for use as a dirtbox. Listen to the soundclips they've got on their site.
The Laney Thread are big and clever. No exceptions.
In a lot of guitar pedals you can simplely change the input capcitor to a higher value and it becomes a bass pedal.

I know there is an Orange Sqeezer made for bass, I just noticed it the other day while looking for layouts.