Liveries are the last thing on the list for a developer and a realistic timeframe is 6 months or so for a new model, if you know what you are doing.
Building the model is the easy bit, (sorry Pilot boy but eventually you will agree with me), getting it into the sim ( and that is just to look at) will take some effort and systems/flying characteristics etc will take a lot of effort. However.....
The joy of sitting in a Virtual cockpit, especially in VR, that you have designed and built is well worth all the effort. and taking it flying., thats where the fun starts.
Its a long and lonely road for a solo developer but I'm sure he will get there with our encouragement and help.and we are always here to help, though at 67, that may not always be the case with me Yes I really am that old