All good suggestions above, One thing I insist on for my all stuff as well as anyone I may be mentoring is access to not only main needles but also midrange adjustments whether second needle type or a bleeder as well as the glow plug with the cowling installed.

This last one becomes even more important in the case of an inverted engine and the probable need to clear engines by plug removal fairly often.

A typical second needle type mid range can be easily accessed usually with a small hole for a flat tip driver and of couse these adjustment only done with the engine not running.

John