Mixing mortar for reclaimed bricks is always a gamble, like when I botched a batch and had to start over.

Ugh I feel for you, that sounds awful. My cousin had something similar happen last year with a store bought cake mix, broke out in these weird red patches that felt hot to the touch. Took over a week to calm down even with antihistamines. Makes you wonder what's even in some of those pre made things.

Thermal stress cracks really are the worst way to end a trip. I feel you, last thing I made at home just sort of slumped over like a tired candle. What did the workshop say about the broken pieces, anything?

You mentioned feeling bad since he designed it himself. Does he see this as a prototype or a finished product? That distinction might clarify how critical your review should be.

My grandma always kept sunflowers on her kitchen table. They really do feel cheerful, not just look it. That customer was onto something.