I don't recommend using lasercutting for plastics. Most of the machine shops I've talked to that offer laser cutting simply won't do that kind of work with anything other than aluminum, steel, or titanium. It's also just not a cost effective method and in most cases takes more time to do correctly than it would with standard tools. Water-jet cutting on the other hand I have had done with plastics and you just have to keep the thickness tolerances in mind. I have extremely limited experience with Acetal, Delrin, and Nylon. I left them it out since they are considerably more expensive than the other materials listed. It's not something I felt I should include in a beginner's guide. You are correct in that they're ideal materials for load-bearing or frequent wear applications. Neither of which instances an entry-level machinist would presumably be capable of designing said parts. Also, Acrylic is equally as dangerous when it comes to fume production at certain temperature ranges. It also begins producing fumes at a lower temperature than polycarbonate. I don't recommend using flame polishing for either unless you have a serious filtration mask and a ventilated work area. As a standard it's best for most people to simply use sanding and polishing since the more "convenient" methods required exprienced hands and controlled environments in order to be safe. Nothing you mentioned are items I feel would be reasonable to include as recommendation for the entry-level machinist for safety and experience concerns so I have omitted them.