Does your Brown’s Gas, book 2 give instructions how to build the ER50?

If you wish to build your own ER50 sized and application optimized electrolyzer from my plans, I recommend:
 
Brown’s Gas Book 2, with it’s online Resources
 
ER50 online Resources.
 
These two resources will give all the information needed by a normally skilled DIY handyman to build highly efficient and practical electrolyzers… And to use them safely.