I was building my QMX yesterday and the L508 and L512 toroids were a tight squeeze, but did just fit after adjusting the diodes, mounted as per Hans' instructions. The RWTST tfmr was fun to make too!
I tried to put the body of a resistor or diode away from the toroid, but it wasn¡¯t always possible. Ultimately it wasn¡¯t much of an issue. The toroids snuggled down pretty easily.