They fly 20 inches and the breath template I believe is 10 inches in length? If you are in range then so are my Chimeras and DP.
That's 20" fly + 8.5" template which is still out of range, and even at exactly 30" range you'd waste the breath to touch a single model with the tip of the template.
I don't have the book, I'm thinking like this:
300 odd points for archmage
130 for waystalker?
around 140 for footed bsb with waystone?
625 minimum core, lets make it 650 (I think I can squeeze in 3 units of GG and 2 of GR or 2 and 2) GG equipped one with hagbane and one with trueflight. I don't see the need for magic arrows on riders. Starfire if there are points available for 3rd unit.
450 rare for 2 units of 10 waywatchers and eagle
Sisters are 1 point over warlocks right?
140 with musician so 280 for 2 units of 5 with musicians.
Leaves me about 500 points to play around with. I don't see the "Have my cake and eat it too" case. The 500 points I'd probably spend on 2 minimum sized units of warhawks, maybe 4 models each since I don't know how many points they are and then bulk up the rest. Maybe second eagle.
There is also no 1" rule for deploying terrain. Technically you can put terrain pieces on top of one another. Building on a hill, forested hill, fence in the woods etc. Keeping terrain spread apart is an old edition legacy (used to be minimum 6" apart)
I don't see them being a top tier army either. More of a middle of the line but only because tournaments run a 20-0 scoring system. It won't be hard to pull of tiny wins with wood elves.