Looks awesome Alex

well done for taking the time to do this.
Can I just add a couple things? Just a bit of an extension on what is written....
-Be clearer on the need to only do light coats of etch primer
-Mention about the need to wipe prepsol off before it dries (wipe on, wipe off )
-Dont press too hard with a brand new tack rag, it is possible to smear the resin on the panel (there is no real need to scrub with it anyway, its best to wipe over softy to pick up light dust)
-Im wondering if you want to go into more detail with the high fill rub down proceedure? Express the importance of keeping flat panels flat and not marring edges....
I like to use a large hard block for large flat areas, and make sure i use long strokes, generally diagonally over the flat area, so if there are some small highs or lows, they are feathered out nicely.
Make sure you run with the lines of the vehicle, and not cross over panel edges/creases... there arent too many in a mini, but say the 'waist' line on the car running around it just below the windows... One trick I have learnt is to use masking tape to find the panel line, mask along it and then sand up to it. When the tape is removed you will see the nice edge because of the guide coat giving you two colours. This you can use to see that you have a nice straight line then mask opposite direction and sand on the other side of the line. The tape will protect it from you crossing over the line, and also help make a nice straight edge.
Just be aware of what you are doing when sanding along hard edges like rear window sill and where the rear quarter bends into the door jam... dont sand these mindlessly, try not to burn straight through all the high fill, and keep a nice consistent line to the edge.
Im wondering, you dont do a second rub down on the high fill? For an immaculate finish, I re guide coat and do a wet rub down with 800 grit. Just to make sure there are no scratches left at all.
I am personally very fussy with the high fill part of the whole proceedure, I find it to be very important to the final look of the job, in regards to how straight and neat the car will look at the end.
Just remember any little scratches you see in a matt finish will be magnified ten fold with glossy paint
Hope I am not stepping on your toes Alex, just my 2 cents
As some people have mentioned there are many different ways to approach this kind of work, sometimes its purely personal preference, so if you dont have a personal preference, any good method will get you there! lol