Hi all !
Thank you for your replies ^^
image360, I know that there is a huge security part in the project, making it safe and harmless...
In fact I didn't talk about it because it's obvious...Especially in France where laws are strict ^^
This is the goal of the project, making a harmless device thanks to a serious study and reliable solutions !
In fact, for the securtity issue, I've already seen a parachute system for smooth landing in case of GPS or quidance problems.
Even more if I go your way you forget to talk about flight restrictions...
For example in France the laws aren't very clear about flying a drone for professionnal issue.
A best it's possible but under 150m high, over private places with the owner authorizations...
But you know as well as I do that in a few years drones will be everywhere, people will find THE solutions ^^
Working on a reliable and secured device nowdays doesn't sounds nosense for me
I'm sorry if I wasn't clear in explanations, but the society who I was talking has some of the best engineers on the development of such machines ^^
It's why they're expansive ^^
Trust me when saying that if it wasn't possible I would'nt even talk about it

Maybe after hard study it'll be too hard, but trying is the start
I actually have an alternative solution for aerial photography and virtual tours working with an other society wich uses helium baloons.
For now on it's sufficient but I'm thinking of the future ^^
Thanks Birdseye for the masts alternative, I've already studied this but I'll be interested to have more information of wich material you're using (mast, pano head and camera...)
Have you heard about the kite solution ? I've look around and seems to be an interesting compromise pending.
Net360, I know this one, it depends on wich camera you're using, take care of the weight ^^
More weight you have, more battery you'll use, the less time lap in flight you'll have.
I was ladling on the Okto in my case. More flexible and customizable.
Therefor the site you've linking is shamefully expansive !
You can own an octo with all you need for you camera for 4000-4500€...But have to do it yourself !
Thanks again to all and hoping to have more returns about this ^^
Best regards.