emulatorII-list

I've been going through the archives (and I've checked out the compatibility list) but still unclear on a couple of things. I Apologize if these topics have been covered. 

1) How can one tell if a rev 0 EII has been upgraded to the RS-422 interface? If not, how complicated is it to do this? Are the necessary parts still obtainable?

2) Is there anything else to look out for with a rev 0?

3) Has anyone succeeded in getting one of these old Macs on the internet? Is ethernet even an option for them or would it have to be dial up?

4) How much drive space do you need to hold say a 500 disk EII library? Is it possible to replace these old Mac drives? I'd imagine a 15-20 year old HD has to be pretty prone to failure.

5) How much of a factor is ram for performance? I'd like to get something compact/all-in-one, like a Color Classic or a Powerbook, but the ram configs I'm seeing for those in the compatibility list all seem much lower.

Thanks,
Jeremy - Hoping to be the proud owner of a rev 0 very soon.