Looking at a new 7bbl Mash Tun, and considering going uninsulated (cost), and a flat hinged lid instead of a dome. Would like to hear from anyone who has experience with either of these options please. Drawbacks?

I understand with the flat lid the Mash Tun isn't really CIPable. But it will give better access for manual mixing during mash in.

We are looking at it being direct fire, with heat shielding around the base of the tun.

Any opinions or insights welcome.