A corner aluminium insert supports the portion of the engine and creates enough air conditioning and advertisements tightness. The leading insert can be used to improve flex as required depending on each track. The inserts are connected with machined flanged threaded alu peanuts from top, so that the carbon wont harm.
The framework with both inserts is all about 60 grms lighter compared to the same in aluminium.
Serpent brass weights could be used to position the extra weight in preferred places.