I have an Technician player who has taken Engineer and Outlaw Tech specializations that is expressing interest in building his own droids. As he's described them, they wouldn't be sentient, and mostly built to serve a specific purpose - like a cam droid that can feed footage back to his visor, or what would amount to small pets that could operate as his weapons. I guess, picture many lethal remotes.
I realize he can already buy much of this, but he seems keen on building his character in this direction. I've let him collect some parts from different droids they've dispatched, and I figured this would be a long-term project, not something that he just rolls and builds in one session, but I thought I'd find more information on this in the books or on the forums. It seems like I'll have to homebrew some rules though.
I can probably stick to existing droids, attachments, and modifications to keep things in perspective. I'm thinking some money should be involved, and the parts and labor he invests will simply reduce the cost that it would normally require to purchase an equivalent droid.
Still, I'm worried about this getting out of hand - an idea that sounds innocent enough but potentially becomes game breaking in the future or used in an unexpected manner. Any suggestions or advice in this regard?