So production started in 3DStudio Max 2011 and certainly toke its time, but I don't remember any issues with the modelling or texturing, appart my usual mistakes I make, because I don't use real measurements 
The process, to start modelling it, is first I make the acf in plane maker when I have the only measures of long and wingspan of the plane. Then I translate that into 3DStudio Max and with a very basic blueprint or photo I put those in the front and the side. But that is all. The rest of the model, is done by eye, comparing lots of photos... and when the exterior is done, then the cockpit is build. An Outside-inside process, that most of the times is good enough, but sometimes the photos I have don't have enough detail to model them correctly. 
I do never have visited in reality any of the planes I modeled. I only get my point of view from photos, that I have from internet, or from people that help me sharing their photos of real planes they have access to. Specially needed those back panels and roof areas that never appear in the usual cockpit photos in internet.

Once I finished with all the modelling, animation and exporting, came the barrier of making the systems of the plane. And this model specially had several unique ones.
My previous plugin done only by me was 50 lines or C++ code. For the Jetstream32 I used more than 3000. One really huge fear I had, was to produced a memory leak. I am not a programmer. When I was in Physics, in the university, I studied logic, and my approach to programming was only to Turbo Pascal. C++ was very difficult. But with the help of Anton Volkov, that game me the plugin functions to produce a custom dataref.. and my knoledge of logic, I could complete the Jetstream plugin. No graphical stuff (I don't know how to do that. I wish I could!)
There were no issues found in memory leaks (uffff!! because I wouldn't know how to solve them), and the most proud I was in this plugin, appart to be done, was the manual starting of the plane, plus the mini failure system that I introduced, when the plane was not flown correctly.

To release the plane in christmass of 2012 I had to make an ENORMEUS effort that made me the last 40 days working 16 hours/day. Being father with 2 children and working for Laminar, believe me the energy to gestionate that is near impossible. But thanks to my loving wife, I would do it.
That effort, and the next years working in Laminar were the culprit of the stopping of my stop in any other personal project for 5 years.

This is my most complicate project done until today only by me, but I loved the hability to jump over the programming issue. I am very proud of my flight dynamics, that are very challenging specially on approaches, where I mimic the great Majestic Q400 stall moments!
Maybe in future I would do something to the plane. For Xplane11 I redid the normal textures to match with the PBR standard. No Substance Painter was used. Maybe in future....  The plane sells good, and is loved by the people that bought it. 
There is a feature that is not liked by a number people. This is the lock controls. To make it I had to program to read the assignation of the controls, then save them in memory, remove them.. and when the user moved the lock lever to release position, re-asignate again from memory. The problem came when the user quit xplane with the lever in the lock position. Xplane quit the plugin continuity, so for that reason I made an special checklist, where you had to load another plane before quit xplane. Now in xplane11 all the controls are saved in personal configurations, so that problem is solved, but from your errors will learn in future (still I like the option to not move any lever. There was no other possible option to make this without this type of programming)

Product Description:

The British Aerospace Jetstream 32 is a high-performance turboprop airliner capable of transporting up to 19 passengers.