ive fixed a few of these engines and have one in my Lotus race car , so i'll try to educate some of you.
the engines are quite simple to rebuild by modern engine standards however the timing chain set up is quite horrible and nearly all internal parts are horribly expensive, even non-genuine stuff. it would no longer be cost effective to fully recondition a stock engine in a stock Aurion as the value of the car is bugger-all. The TRD model uses an identical core engine but of course its worth a lot more due to the other stuff.
A basic rings and bearings "refresh" is still expensive due to the silly $ asked for gaskets sets and the man-hours requires to strip and reassemble
The con-rods are sintered metal, not forged. they are a well-known failure point in highly modified engines, but rarely give trouble in stock engines.
The pistons are eutectic alloy, so quite tough for a high performance production engine and good enough for Toyota to accept them for the Aurion supercharged engine, albeit with low boost. Forged pistons and rods are always a good idea for highly modified engines because they will suffer a lot more abuse. Several vendors offer them
who-ever dreamed up this idea of rating conrods by HP is having a lend of you as its purely a marketing gimmick. in my engine building experiences, i've seen $50 chinese "forged" conrods work perfectly ok in 300HP/litre turbo engines... its the bolts that usually fail so if they have good bolts, and are properly machined, they are usually perfectly OK.
I worked with ACL to get the race series bearings made for this engine, but they wont make up for other deficiencies like sintered conrods
i'll try to assist anyone with a specific tech question