You're a little ahead of me there 😂 I've been interested in this for some time and know where a similar system is installed in the UK, I suspect the costs will be way above those of CSS but lets hope not when I discuss it with them, ideally I'd like my own source for installation and manufacture of the part which at the moment isn't beyond the scope of possibility, it would depend on the need for specific machinery but there are people I already use for some clever stuff....If building for 300+HP, I hope you at least consider a CSS, 'specially since it's already torn down far enough. Shipping across the pond might be out of the question, but maybe there's someone closer that does this --- other than Darton sleeves.
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This is the concept used by CSS --- Cylinder Support System – cylindersupportsystem.com
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In your pic is that the above part 'plus' liners? There appears to be a coloured ring at the top making me think it's also lined, if so was that an expensive thing over there? A specific liner type? Lining isn't too bad here generally, I haven't explored any specific performance kit....
Unsure if I'd do it at all, although I agree it makes sense. Most are tuning these with the turbo, meaning everything is pressure related if that makes sense, I know there's going to be high pressure anyway being a turbo but I'm stuck on the fact people are cramming so much air in to force the crank to turn high gearing that it is what's responsible for the failures we're seeing of rods, cylinder tops, and clutches if not pistons which we know are also affected by oil consumption too on some. I'll continue my thoughts on this below.