Leach SuperAmp transformer sizing

[proto55]

I am currently building a Leach SuperAmp to power my 4 ohm Magnepans. I’m having a slight difficulty sizing my transformer. Would the Hammond 182Q60 (60V @ 12.5A) be suitable for a 4 ohm version of the SuperAmp? Also does anything else besides the transformer need to be adjusted to drive a 4 vs 8 ohm load?

 

[proto55]

I figured this was the right place to put this question but if it needs to be in the parts subsection please let me know and I will move it.