Chewtobacca said:

That's the entire point of the comparison I made! You could do it. Open the sunroof. Have deliveries sticking out of the boot. Make more trips. It's possible, but it's not likely. That's my point. If Anakin's mother needed help, it's possible that he would build a droid specialised in protocol and translation, but it's more likely he would make her a droid more fitted to the purpose.

Yes, but he happened to find protocol droid pieces.

Chewtobacca said:

So what? He can still build one. If he wants to be a pilot, having him build an astromech would at least make sense.

Yes, but as I said, he wanted a droid to help his mother. If he didn't find that a protocol droid could the job, he would never had started to (re)build him.

I argued that a more plausible scenario -- if you want to have Artoo in the film -- is to have Anakin build the droid for himself.

But the current scenario has nothing wrong with it. As far as R2's concerned.

P.S: Gonk is a droid. ;)