Short answer; no.
Long answer; seriously, if you're going to convert a piece of equipment from previous editions you're going to need more than just the description and isolated rules. Modifications in prior editions had a whole slew of rules associated with them, and in my opinion that's important for context.
I've already provided you with a link to where you can buy the books legitimately. I'd suggest you go ahead and pick up Arsenal and Cannon Companion if you're really serious about doing this conversion thing...