I have now an artist, who helps me do some custom models for some 2.7 content and future content for 2.8 and beyond. The new Air Condenser model is his work.
https://llesar.artstation.com/projects/XJe94n But besides that, any asset requires work to get it to be game ready, no asset you get in asset store is game ready as is, some take small amount of time to get ready for game, others take much longer, depends on the asset, which asset store it was bought in, what kind of modifications it needs to have to fit the game and the mod (and theme), what kind of extra tweaks it needs to have, some require a lot more work based on use case, maybe custom code and so on - there's no simple answer to this, only those who do modding would understand this.
"People here know almost nothing about 2.7"
Most of the work-in-progress stuff I only share on my discord for backers/patrons in form of screenshots and unlisted videos and eventually when those things are more refined and ready for a public review, I post about them to everyone else as I work on the update, but until I am still unsure and not comfortable/confident about something, I don't post about it to mostly avoid confusion. Not everyone takes their time to investigate why something is being worked on for the mod and it's really tiresome to explain it to many newcomers of UL community.
UL 2.7 takes so long not because of A21 or V1.0 release, but because I had certain goals in mind, that I wanted to achieve with the update and I'm working towards delivering them and hopefully most people will enjoy all the changes coming with the update such as the overhauled electrical system, that will also allow me more flexibility for future content, since I had plans to expand what you can do with power (powered workstations, for example, that are coming in 2.7 in limited amount (cement mixer, powered oven for cooking, powered high tier electric furnace)) and more. Then there's the overhauled research system, that will be in a form of a research tree, divided into multiple categories - something I wanted a long time ago in the game, but just did not have the experience to pull it off and current system you see now in 2.6 was just a temporary solution while I work on the new stuff. The skills will be reworked in 2.7 as well. Besides those 3 major things, there's a bunch of other smaller changes, such as optional picture in picture scopes, cooldown for doing POIs, light tweaking options, new firefighter zombie, new traps, new resource items, new props, weapons and more. UL 2.7 never was just about porting of what I had in 2.6 to the current version, but to keep working on the mod and improving the game in areas it needs improvement and that just simply takes time, so please, be a bit more patient, the update will come. And remember, it's just me doing most of the work, there is no team, and if I get sick or have IRL things, stuff gets delayed, can't do anything about that.