Looking forward to some pics of your PHB fab. It worked very well on my 2006 Mustang GT even though it had coil springs.
i looked into that pretty heavily. the mumford link puts the roll center really low. it can put the roll center below the the bottom of the tires. you want your rear roll center higher than the front from what i have researched. as far as i can tell, the mumford leak is most effective on dedicated road race cars.