Personally I'm always in favor of another seller on the forum. More variety is great.
One crucial note I want to convey to you, because it can make or break you.
Communicate. If a message is sent, it MUST be replied to within 24 hours on weekdays, and next business day if it's the weekend.
Most people are willing to cut a lot of slack if you tell them what's going on, and run into a problem. If you just disappear for a week, that will no go over well, even if all you're doing is taking a vacation.
Make sure people can contact you on and off the forum too....
Lastly... one thing in a kit form that I haven't seen, and think would be great... an unlimited run time laser. Seeing as you plan to use a custom heatsink, that you are making personally, and aren't going after the high mark 2W+ lasers... this would be a good niche.
Good luck, and hope to see you do well.
Heatsinks
I already have a V2 heatsink design started. That combines the heatsink and focus adapter to look really cool!