The structures aren't defined as Hex symbols, and I believe that is intentional. Hex symbols in CC3+ has some special properties, one being that they replace each other so there will only be one in any given cell. This enables quick mapping and easy changing of features without having do delete stuff first to avoid ending up with a stack of symbols. The mapping guide for the style also mention that they are not true hex symbols.

Unfortunately, that also means they won't scale automatically, so you need to manually set the correct scale before using them (although it should normally remember the scale if you just placed a hex, but if it doesn't set it manually). But once you have set the scale correctly, the snap grid for the map should allow you to place them correctly aligned on the hexes.

I did notice your snap grid was wrong, and after checking it seems like this is a problem that occurs because you set the grid from the new map wizard. Unfortunately, it can't set the snap grid from there for some reason (notice it is greyed out), so life is easier if you make the map without a grid, and then just add it immediately after creating the map from the wizard, as this allow the correct snap grid to be created. Not sure why it is like that, but at least adding the grid afterward is an easy workaround. (Or, you can just edit the snap grid manually afterwards, that works too)

Not sure why you can't change the colors here. I went through the instructions and it seemed to work as described for me.

Which color is it you have problem changing? The color of the costlines, or the background color?

I don't know about any videos or additional instructions, unfortunately, but the data is quite detailed, so you should be able to cut out the pieces you need and not use the entire world after importing it.

The rotation commands allow you to type in the exact amount on the command line. I recommend the non-visual rotate for these operations, which you find by right-clicking :CC2ROTATE:.

My immediate thoughts are that this seems fine and within what the license cover. However, I cannot provide official answer, nor give any kind of permission.

The best approach is to ask ProFantasy directly. That will give you an official answer, and if needed, the required permission.

Check your sheet order. Your floor is most likely on a sheet that appears after the symbols in the list. Use the List command from the info menu to check which sheet your floor and the symbols you are trying to place are, and adjust the ordering accordingly. Remember that stuff on sheets at the end of the order appears on top of things from sheets higher up.

It is also possible that the sheet order is wrong and your symbols go to the wrong sheet. But this will also be revealed with a use of the List command. If the symbols are on the wrong sheet, use :CC2MCHANGE: on them to move them to the right one.