Thanks Ramesh. I have lined the inside of the upper lid with the foam that Engel have supplied, and if I need more positive ballast i am going to use Expanding foam. I have tried this on other boats and its great for providing extra lift. Plus easily moulded. But messy
But I agree with what you say about the clips now you mention it, I hope they arent to heavy and make it slightly top heavy. I chose the ones that are hollow so I hope they will work.
Probably not, I have found on my subs its one step forward 1 1/2 back
Paul