@Sonicviz So I have had chance to install this and got to say firstly, I LOVE the idea, it is sorely needed and I didn’t even CONSIDER that modding the menus in this way is even possible. You are on to a WINNER here mate and I would love to help you out in tweaking / testing and giving you ongoing feedback if that would be useful.
Here are a few first impressions / notes / questions for ya!
FUNCTIONALITY:
- It’s a shame that the “Save, sort, and/or filter by your own custom tag system” is not yet in - I assume that is the way to add Favourites to a secondary group/filter? That is what personally I would find most useful in a tool like this but I understand you want to keep that back for a premium version - however that probably also needs the most feedback as to how it integrates to be user-friendly and actually faster to use than other methods like text search. Do you have any WIP version you would be prepared to share with me?
- What is the TIME column? I have a few at -1 and some at zero. Highest is 37 but that is not a plane I have flown much, so not sure what this is filtering? I ask because @Funghie, @MojaveHigh2379 and myself have developed an app to extract the Hobbs or Hours data from players local aircraft, and this could definitely be a useful sorting filter in this scenario too (I think they would love what you are doing too!). I can send you a link to the app if you are interested to check it?
- Any way to make a click anywhere on the ROW to select plane, not just the thumbnail?
- Can I not edit the NOTES column in this version? Where is it pulling that info from?
- Is anything planned to work on Right Clicking a row? A mini-menu with options there?
- Is there any way you could associate a “preferred initial livery” per plane model?
- Is it possible to EDIT (or override) the metadata? For example, I have some aircraft in OTHER category that are Rotorcraft etc etc.
- How about being able to create your own FOLDERS as a screen before this (large icons on the screen, similar size and layout to the main hangar), or accessible as a TAB BAR along the top above the table header (like in a Browser) then adding (via tickboxes per plane) individual aircraft to those folders. Same plane could be in multiple folders (hence the tickboxes) so you could manage you own minified collection but still see everything if you select the full list view as it is now. Also the saved plane would be with the assigned livery from point 6.
DESIGN:
- Would be a nice touch in the header titles were a bigger/bolder font AND used the icons as in the official stats (and new ones for your extra columns) to spice up the look and feel to be more like native4. The NOTES column needs to word wrap within each row, or maybe click to get a popup
- Maybe you could give the option to show the thumbnails at a larger size (double). I know that would make the list “longer” but if you have any text formatting control within the rows, it might look better with the Manufacturer and Model Name as a bit larger font than the “info data” columns anyway. The model name cold be BOLD below the Manufacturer
- And perhaps some different layouts that leave out some of the date but show it as a grid instead with info stacked below (more like the hangar but smaller thumbs to get more on screen).
- Maybe just my resolution but the AIR MANAGER FREE button title is missing the last E (looks a bit of a mistake but is scrolls when you are highlighted on the button). Maybe rename it somehow to fit 1 more character (HANGAR MANAGER might fit).
- ROTORCRAFT is truncating in the Category column (missing FT)
- Could you alternate the row colours (white and light grey) to make them easier to scan… on ultrawide that is a pretty wide table!
- Likewise, the vertical columns could do with some division (thin grey line) perhaps.
Hope it helps - I feel a bit limited in what I can say until I see what the other stuff you have planned is but I see great potential and happy to assist further should you need another pair of eyes or some UI / UX brainstorming 
A while ago I did write a suggestion in a thread for exactly this functional tool. This is what I wrote originally (it may be of use to you):
Have a little “sort by” menu like in Steam:
- Alphabetical
- Most Used
- Recently Used
- Category (i.e jets, props etc - which we do have already, I know)
- Favourites
From post #36 here:
Cheers and good luck!!