Thought this was quite neat
nice job from the Aussies

they're not cheap

V12 LS Engines - Race Cast Engineering

Pretty cool they offer it in different stages. Not cheap but very unique.

Cool but the cost!

i don,t think its a bad price for a complete engine 55 g heck i think a new merc outboard 450 is 50 g

Earlier this week sat in our webinar from Race Cast and Aust Foundrymans Assoc walking through the process of 3D printing and casting of the LS V12 block
seems like there is another project in wind for double overhead cam V12
thought maybe of interest

https://webcast.csiro.au/#/webcasts/afiracecast

Cool but I think XVI Power's V16 LS is better. Not only because it is bigger but because it takes 4 standard LS V8 heads, and 2 standard LS intake manifolds, not a proprietary V12 head and manifold. It's also oiled in the center, not from the front. Really hope to see one in a boat soon.
https://www.xvipower.com/