im fairly certain the rate in which you skill up abilities is impossible, I believe you have to have another point in some other ability by level 8. Again not sure, but fairly certain

My belief in getting turrets at 6 is because that is the level you get two turrets to lay down. A good Heimer will ALWAYS have turrets in his stockpile and will never be out of turrets while laning so there is no need for heal if you can simply replace your down turret. This is the level where junglers come out to gank and having two of those turrets beating on them makes it unsustainable for them to continue on ganking you if you kite them right.
However, I can see the reasoning in getting Upgrade at 6 but I think having rank 3 of Rockets and rank 3 of turrets 6 levels in makes you a very powerful harasser and nearly ungankable unless they suicide dive you at your tower but 90% of the time one of them will die. You could get the turrets at 5 instead of 6 but rockets are your priority and you always rank it when it's up.

I think you should probably still get one point in UPGRADE because of the heal and the slow, it will help you get kills then adding a point in let say turrets. Getting turrets to level 5 isn't very important one vs one.

Other then that good guide +1!

This guide could use some work. I like your ideas though, that's for sure

Overall, pretty good guide. It could be longer though, still has a lot of information that it can contain. I'm sure it'll become great if you "up" it a bit more. Like make it more "prettier" I guess? (hint: BBCoding, Extra Information that will help your reader). Remember that you're expressing this guide to the community, so you want to make sure that people will read it and think it's good. A good way to do this is to pretend you are someone else just reading your own guide, and make your own opinion on it. When you feel it's 100% perfect and can use some small amount of feedback from the viewers, it's probably a good time to release it.

I'll give you a +1 to give you a headstart. Hopefully you can look around at the top rated guides and see how they are. Maybe it'll give you some influence. Anyways, wish you the best of lucks in the future and hope this guide becomes "greater"! Keep up the good work and improvements on the way? =)