I have built a IPE/Boo with power lam 2 years ago. I had some trouble with the intersection point of the power lam/boo/IPE. Used TBIII Bad glue lines. Filled with CA glue, and sinew wrapped. I glued it all up at once. Had a tough time getting the power lam centered, and wrap the whole mess with inner tubes.
Starting a BBO and this time considering glueing down the power lam first, sanding into the osage for nice smooth transition, then URAC the Boo or hickory on.