Thank you for replying Ant, I've been aware of your work for a long time and it's great to get some feedback from you.
On the 'Professional Differences' it was a balance issue, because I considered how nasty it could be to have a gang with a bounty hunter and a monster hunter in the same gang. I've ruled out ratskins because mostly I use the old rules (the good ole Hardback) and with Ratskin additional resilience to big beasties and their everyday lives coming across sump creatures, I figured they would sniff at his 'reputation'. I liked the idea of giving monster hunters a bit of a disreputable reputation, and if you do run a lot of beasties in your campaign, he can earn you an large amount of creds.
Likewise the table is there to balance out the Hunter's special abilities, as he can annihilate most creatures quite easily.
On Ratskins, the main reason for restricting them is I was thinking of doing a Ratskin 'Turok' style Monster Hunter variant for Ratskin gangs. The only reason I haven't already is because none of my gaming buddies used Ratskins in our campaign.
I've took your advice with the skill tables on both, I think I pretty much followed the typical hired guns style to the letter, so any change isn't a problem imo.
I like the idea of some kind of way of adding monsters into games. I did think it was troublesome that it relies on players being willing to add monsters/beasts to their games. I'll do a bit of reading and see what I come up with; I welcome any suggestions.
As for the las-longrifle or 'long-las' it is actually the name of the sniper rifle that Ratlings typically use, the current Imperial Codex mentions it under sniper rifles in the wargear section. I switched the order round to make the full name sound better. The range bars are currently 0-24/24-36, and I figured the shorter range made more sense, because that is quite a distance. I'm open to changing it if you think it makes more sense - I'm just checking you noticed the range sizes.
As to adding Hotshot, I've refrained from doing so because Ratlings have capacity to not only upgrade their long-las, but get their hands on a Needle Rifle. For that reason (not to mention the high chance of the ratling getting 'marksman') I avoided it. I could factor it in though and up the strength (I'm fairly sure that's what the hotshot pack does) if you feel what he has isn't enough.
Restricting House Cawdor is an excellent idea, and I've added it to the list of restricted gangs.
I've made some of the changes you suggest but I'll wait a bit for some more feedback before I update the PDFs.