edited my post above but ive sent the cylinder wall pix to my friend just now, he agrees with you on the wrist pin falling out. It points toward installation.
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I did have them fitted by a very reputable garage who mainly deal with Subarus but definitely know their stuff. I'm not prepared to name them on here as this post wasn't to slag anyone off but to merely point out that i have received no after care sales services from Altezza Sports after asking him to help me.
I wouldn't be even going down the line of product failure if all evidence wasn't pointing to that. Like I said previously the piston is going off to a lab for testing and they have assured me they will be able to report for definite if the metal was defective before installation. Don't ask me how they do it, I don't know but that's there job not mine.
Also, the pistons were ordered from Toda/A N Other by Altezza Sports in accordance with the engine specification so they were the correct size etc. The piston rings, circlips and pins were all supplied with the pistons.