I've been following FrankenWashie's build thread, don't want to hijack so started another for a similar guitar.
The ESR-1 Resonator kit arrived today, fast service by Adam and Australia Post, thank you both.
Like FW's mine also has the mini humbucker cutout a little too close to the end of neck. I think the answer will be to widen the recess on the bridge side of hole, comments please?

Click image for larger version. 

Name:	20180326_121149.jpg 
Views:	240 
Size:	248.5 KB 
ID:	25614

My cone appears to fit OK into body without any additional machining unlike FW's. It's 40mm from top face to bottom of recess. The bottom of recess is wafer thin and under it there's reasonable size air gap before the outer ply back.

Click image for larger version. 

Name:	20180326_120832_001.jpg 
Views:	241 
Size:	272.4 KB 
ID:	25615

FW says his measures exactly 24.75" nut to bridge. Mine is approx 1/16" longer from inner nut to inner bridge, is that OK or should I correct the length?

Click image for larger version. 

Name:	20180326_140701.jpg 
Views:	263 
Size:	250.8 KB 
ID:	25616

I'll be watching FW's thread, particularly the piezo & pre-amp situation.
Thanks in advance for any help or comments.