Help with updated airport - can't get custom models in

I am updating a local airport and used a YouTube tutorial to do so. I have the airport created, the runway, taxiways, etc. all made along with using stock hangers, fuel tanks, etc. Everything is working well with the exception of adding any custom models. The custom models will not show up in the SDK as an option to select and place. These are models that I have added in to previous scenery projects that I did while learning the SDK so I know the models work. I am sure it is user error but I am at a loss. What am I doing wrong? Here is my folder structure. Thanks in advance for the assistance.

5M9
…….	_Packageint
…….	PackageDefinitions
…….	Packages
	…….…….	sl-airport-5m9-marion-crittenden-county-airport
		…….…….	ContentInfo
		…….…….	scenery
		……….….	layout.json
		……….….	manifest.json
…….	PackageSources
	……….….	data 
		……….………..	5M9SCN.xml
		……….………..	5M9SHP.dbf
		……….………..	5M9SHP.shp
		……….………..	5M9SHP.shx
		……….………..	5M9SHP.xml
	……….….	modelLib
		……….………..	FuelTanks *Custom model #1
		……….………..        ElectricalBoard *Custom model #2
		……….………..	texture *Contains textures for 2 models above
…….	5M9.xml

You don’t seem to have any Asset Groups. You need to add one ArtProj (with asset dir pointing to your modellib folder) for your models and one BGL for your airport (those should show up in a XML file in PackageDefinitions).

Hello.
If you have everything correctly setup (folders, Asset Groups, AssetDir, etc.) and still can’t see your custom objects in Objects window when you have your project loaded:
I started experimenting with custom objects yesterday, followed all the directions (thanks everyone for providing tutorials!!!), but checking and double checking everything I was still not able to see my custom objects.
In my case, the problem was that I did not copy my built package from my project “Packages” folder to my “Community” folder.
I was exacting for SDK to read my “Projects” folder contents that is located where I have my project related files (xml, etc.). For some reason SDK is looking inside “Community” > “my package name” > “scenery” > “my company name” folder and not where the SDK builds everything when you build your package (it can be that this is how it should be, but I was not exacting this).
So, build you package in SDK, move it to Community, load you project, check for custom objects in the Objects window of SDK.
I hope this helps.

PS. I think I know why my Projects location is not being scanned for my custom objects.
In SDK under Tools, open “Virtual File System”.
I don’t have path where I have my Projects, listed in the “Watched Bases”.
I just need to find where to add to “Watched Bases” and most likely I will see my objects without moving my package to the “Community” folder. “Community” is listed under “Watched Bases” in the “Virtual File System” window of SDK.

I attempted to add the ArtProj but no matter what I did it would not insert this as a child node in the project editor to my project along with the already existing BGL. It would add it as a top level node. I ended up scrapping that project and starting a new one using the sample scenery folder in the SDK and renaming everything to my project and that did the trick. Now I have two child nodes (BGL and ArtProj) and am able to continue work. Thanks for everyone’s help on this.

Could you point to the youtube video?

Thanks a lot.