Depends how many bars you have
I worked mine out to be 45kg I think, but have full rear X, both doors X, and through to the turret, with a floor bar, windscreen bar, and horizontal support bars too. Given my driving I'm glad...
Sunroof- can go or stay, a good cage should use a windscreen bar, which means you can't operate the sunroof, so it's kinda pointless.
I'd not want a full cage without this bar to be honest, and most trackdays don't like you having sunroof/windows open so your arms don't fall out (which naturally they do on the road...)