You can spend a fortune on Tiger books if you are not careful, most showing the same basic stuff.
For a King tiger build, i recommend the Superking book that was recently re-released. For the price, you get 450 pages on how to build the Trumpeter 1/16 King Tiger, but other than the interior sections, the rest is fully applicable to RC tank exteriors. It includes 58 pages of historical black and white pictures, and 125 pages of close up color pictures of the real thing. Ideally, you should purchase a Trumpeter kit and extrapolate everything to 1/6, shapes, angles and dimensions.

- Superking
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A bit more generalistic, volume 6 of the Achtung Panzer series is also very useful, with pictures and detailed graphs, and has info on all tiger variants, including the King Tiger. I have the whole series. I do not have a Panzer build without them on the bench.

- PanzerKampfwagen Tiger Achtung Panzer No.6