Chainmail/AD&D First Edition Rate of Fire Rules for D&D Fifth Edition 1

Here's my homebrew conversion of the rates of fire given for different ranged attacks in Chainmail and AD&D First Edition. I'm posting it here not so much because I expect anyone to want to use it in their games, but because I'd like any feedback anyone would like to offer regarding how it might interact with any rules I might not have considered. My goal was to give support to the 1E rates of fire, without making multiple shots per round too overpowered. Only playtesting will tell if I've achieved that goal. I've been using a less formal version in one of my current campaigns, and implementing this document is the next step. If anyone is interested in allowing these rates to be used, I would also suggest using an attack adjustment system similar to the one I posted here: http://www.enworld.org/forum/rpgdownloads.php?do=download&downloadid=1322, especially with regard to heavy crossbows, which would be otherwise nerfed considerably.