So a number of years back (probably over ten years by this point), I started an attempt at remastering all the old sierra game manuals. I only got as far as the King's Quest series before life took over and my enthusiasm petered out.
I thought it was time I shared my efforts. Here's the King's Quest 5 documentation, in the best quality you've ever seen.
If there's an interest, I can share my others. I have KQ1-6, and the map from QFG2.