Thank you Arpi. It looks this way because in my place, I had to struggle for everything. Nothing has been an easy find, I had to machine a base and a wooden handle for my tamper and to lacquer it myself, and I had to find a manual grinder with excellent conical burrs because I can't afford an electrical one that pleases me (i.e. that meets my will to obtain the absolute best in espresso grinders as I feel that the grinder is the device that "defines" the taste of the extraction). The grinder is stepped but is equipped with machined conical burrs of excellent design and size. As for the classic milk pitcher, finding it was also tedious, so like I said, nothing has been an easy find in my place (I bought the machine used from the German eBay and got it shipped from eastern Germany. It's a pre-millennium gold-plated Professional).
I would be glad to team up with you and to benefit from your rapid progress

. I can also help with the photography in case you needed different shots to make descriptions in the manual of more clarity. The foremost concern for me once I started using the machine was the "simplest and easiest way to obtain a bean temperature reading", and whether an environmental temperature reading was still needed in case I had a bean temperature reading. In my case I removed the environmental temperature gauge and inserted a thermocouple in its place in a way that will touch the beans and not get hit by neither the inner blades of the solid drum nor by the supporting rods connecting the drum to the axle (although doing so is somewhat tedious and needs a lot of care. Therefore, I would suggest that a neater and a more reliable solution is developed -which can become a valuable part of the non-official manual).
I roast only around 100 to 150 grams of green beans at a time which may seem too little for someone owning a half-pound roaster but it's because I wanted to learn with lesser taste-bud penalty and lesser wastage. I am currently in the phase of comparing my former results on the modified popper with the results I am now able to obtain on the M3 roaster, which are remarkably dissimilar despite the similarity of the external bean temperature profile.