My house came with an oven extractor hood that had nowhere to vent to, so I've bought a new extractor as the old one was knackered and I've made a channel in the plasterboard and offered up some flat ducting that will vent outside. Once I'm finished I need to box it in I guess with plasterboard ready for a plasterer to come and make it good, so I was thinking of just screwing a baton along the wall under the ducting and another baton to the ceiling and going from there, is there any reason that won't work, or is there a better solution? If I do screw a baton to the ceiling, should I use plasterboard fixings like I elsewhere in the house when I'm hanging pictures etc, like these: https://www.screwfix.com/p/easyfix-self-drill-plasterboard-fixings-nylon-32mm-100-pack/3685h Or are the metal ones better? https://www.screwfix.com/p/easyfix-self-drill-plasterboard-fixings-metal-32mm-100-pack/2422h Some photos of what I'm working with (bit of a mess at the minute), the ceiling took a bit of damage as the coving wouldn't come off without a hard fight!: Out of focus!