Hood Liner Clearance
How close can the wood be to the metal liner?
Combustible Buffer Zones
The stainless steel liner must fully "encase" the bottom of the wood shroud. Most Alberta inspectors require the metal to extend 1/2" beyond the wood edge to act as a fire break and drip edge for grease.
Mandatory 30-36" vertical gap between the cooktop and wood components, protected by a non-combustible metal liner.