Hey there @Saiodin, welcome to the Discourse!
First, as to the image limit, that is a forum setting designed to help prevent spam. After you become a “Basic User”, you will have all the restrictions listed. You can read more about trust levels here:
https://meta.discourse.org/t/what-do-user-trust-levels-do/4924/3?u=jomaxro
As to the building AI issues, the devs are well aware, and are looking for examples of buildings that will not build right now. Check out this thread for @sdee’s post:
As for “basic dev tools” there are actually some great ones in the game already! Of note for buildings, you can open the in-game console (type Ctrl + c), and use a lot of commands. Typing help will give you a list of all built in commands. ib, or “instant build” can be used to complete most buildings. destroy can be used to destroy anything in game, be it a building, object, Hearthling, enemy, etc. reset can be used to deal with stuck Hearthlings, by moving them just enough to get them unstuck most of the time.
If you want even more tools, you can install the debug tools mod from the team’s GitHub. To install, visit the Stonehearth GitHub GitHub - stonehearth/debugtools: Stonehearth Debug Tools Mod, select Download Zip, and save the compressed folder somewhere on your computer. Inside the zip you should find a folder named debugtools-master. Copy that folder to your mods folder, (located by default at C:\Program Files (x86)\Steam\steamapps\common\Stonehearth\mods), and rename the folder to debugtools. Let me know if this makes sense. You will know if it is installed if you see the following icons in the top right: 
. If this does not work, or you want more details on the what you can do with debug tools, let me know!
Edit: Debug tools is included with Stonehearth as of Alpha 19. Simply enable it via the mod manager.
Hope this helps!