You have A.
(thats where you’re stood …)
you have B.
(Imagine thats a little point on the horizon
)
How you get between them two points; honestly i couldn’t care less, hehe
the point is that you GET to B, as quickly as you can with professional results that in this case are technically correct and photorealistic. By ‘quickly’, please understand that this NEVER means rush it, it simply means as quickly as YOU can. Now some people are fasters than others which ultimately seperates the skill level and the pay cheque.
Honestly guys, there’s no right or wrong way, just hit the high way and get moving with the show. The typical process of techniques will generally be photo manipulation where possible, 3d next, then minitures and then when all else fails paint.
Edit: 3d should only be used when the alternative isn’t possible, never use it simply for the sake of using it, unless it makes the job far quicker.
Feel free to do this as you wish, im more than happy to guide you as and where i can, but the methods, well i leave up to you.
Be warned, using camera projections will present further issues.
And yes lining up 3d geo as a perspective aid is a good idea, i do this all the time.
and no, this isn’t a challenge, though feel free to play if you wish 
Cya,
Dave.