Long story short, my Integra has doors and a hatch, all from different cars, a Frankenstein of sorts. It's a coupe, 99. How would I go about getting one key for all 3? I'm fine with having a separate key for ignition. Do I go to a locksmith? Do I find a part out? I've found the door locks and key on eBay, but it never comes with the hatch key as well. Naturally my hatch actuator is bad, so I have to climb through my car to open it .

Any help appreciated!

 

Find a junk car and take all of the key cylinders. 1999 has no immobilizer to worry about so just take the door cylinders/hatch cylinder/glove box cylinder/ignition cylinder and swap them right in.

 

or be on the safe side and have a locksmith rekey them.

 

Can I do that with my current locks? Any idea how much it would cost?

 

You can do that with your current locks, but the cost varies from one locksmith to another. You're going to have to call them and explain your situation. Probably be cheaper to just purchase a replacement lock set for the whole car on ebay for around $120. Comes with all door lock cylinders and the ignition cylinder as well.