Here are a few from when I gave my bilge a makeover.

Doesnt look like anything complicated...if you want to send me a bad one i can make one or two for ya no prob. :)

The old style gill is like molded/casted.I remember paying around $40.00 from Gill a few years back.I still have the old ones.they really didnt crack just got cloudy/dirty looking.

The Hardin/CP Perf one is machined.

What I ran into was overall thickness was more than most shops had in stock

Rob, is that one you had made or one from Hardin?

Thats the Harding old one.I figure if it could be made thicker hold up better,and prob wouldnt look much diff

Here is my old Gil, the new one from Hardin is identical.

Not sure what speeds the boats running or if it has pressure reliefs but if the boat runs faster than 80mph it really should use the billet style top cap that acts in the same fashion as a girdle would and it transfers the support from just the center stud all the way across the entire lid. When we see a lid like yours in the picture start to crack from the center post outward the traditionally is cause by excess pressure or water spikes. Just food for thought.

You could sure try that just make sure the lids heat treated like the original or rather than just crack or splinter it will shatter/break in two.

I have the Hardin/Gil that is only 2 months old and broke one lid already. You dont even want to know what your NEW engine compartment looks like running in salt water when one of them springs a leak.