We could use some LoS maps and also elevation maps or a combo of both. And preferably not 2 years from now when we get the "new rule books". (ok hopefully it won't be 2 years but still there is no reason something like this has to wait until the rule books are finished).
Check your KS updates: Monolith announced the end of November, 2016 for the English edition.
(IMHO, that's unrealistically soon to catch many of the clarifications which are being requested now, but that was what they announced.)
In another thread i saw a mention from, IIRC, Pallantides, saying that the LOS situation would be something they'll address in the new book. Until then...
I am liking the game but it has been very frustrating to not know how this should be handled and I play with "rules lawyers" so if house ruling it can be tricky.
Making a reasonable judgement call is the only viable solution for the time being. Any questions posted here on the topic will only result in people posting their own judgement calls, which will very likely differ from yours.