50w Single-Ended BAF2015 Schade Enabled

Untested DRAFT PCB layout for comment. It will cost me the same to buy two boards as it will six, so I'll donate and ship two pairs to anyone interested in helping to prototype the hockey puck "sh*t amp." :cheers:
 

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Some options.
1) Take voltage from drain of mosfet and use a simple trim pot. Generg's idea
2) Take voltage from supply then add either zener with trimpot or tl431
3) Take voltage from separate transformer with zener or tl431 etc (probably over kill)