Maps were created for veterans of Witcher 3 - for players who knows approximately location of gear, but with no precise locations in mind. So most likely for players who wants to repeat this great game once again or start New Game + after beating normal one.
Relative location of diagrams for Cat(Feline)/Bear(Ursine)/Wolf(Wolven)/Griffin/Manticore/Viper trousers, boots, gauntlets, armor, steel/silver swords and crossbow are shown on maps.

Kaer Morhen Armor is excluded here, because you have it since beginng of the game. Also that 2 viper swords from White Orchard are not shown - they are easy to find and 'probably' does not count for achieve nor they are good items later on.

I named manually some locations on the map for easier navigation. Most maps are in greyscale for better readability; Skellige has no names because there are too many landmarks to be lost.
All maps has North facing up in current orientation.

I'm not sure if color palette is selected well for colorblind people, but you have few maps where you can see only 1 set of your choice. If there are any colorblind person who want to cooperate with me to make maps color to be better designed - priv me please, we'll make it better together.

Any feedback is welcome.

Viper set is introduced in the Hearts of Stone DLC. There is no secondary quest associated with this gear, this means it can be completely missed and you can't get it until specific part of quest.
Viper set parts can be obtained during these quests only:
-The armor diagrams are bought from Countess Mignole during the "Open Sesame!" quest.
You can obtain them only during 1 conversation, this conversation is unrepeatable later on. Prepare few thousdands spare golden coins for diagrams.
-The venomous steel sword diagram is found within the Borsodi vault during the "Open Sesame!. Second chamber where you fight one of brothers and his minions. Left chest, next to the Borsodi's House quest item.
-The venomous silver sword has no crafting diagram, but the forged blade can be found within Gaunter O'Dimm's puzzle world. To get it, when you begin quest "Whatsoever a Man Soweth…" You have to go to Shani first before meeting with Ataman and Man of Glass. Go to Oxenfurt Academy with her to find professor Shakeslock. Only after speaking to him, you will have option to challenge Gaunter O'Dimm and find this sword. After starting riddle in puzzle world find Hym[witcher.fandom.com]. At the left from the road you will see staircase with red light at the top. There will be sword in the stone - this is Viper sword. Map for Gaunter World[witcher.fandom.com]
That's why there is no need for map - just follow the plot.

Guide thumbnail: witcher.wikia[witcher.wikia.com]
Image capture: MS Snipping Tool[www.microsoft.com]
Image editing: GIMP[www.gimp.org]
Witcher 3 maps with markers: Witcher 3 Interactive Maps[witcher3map.com]
Font used for map names (part of default GIMP): Vivaldi Italic Condensed

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Sh33p.