So I am building a new wood smoker/grill. It is going to be a propane/charcoal combo unit. Fully insulated. Inside cooking chamber when complete will be 29" wide and 24" deep with 48" front and 40" back height. I am lining this with some 3/16" thick ceramic tile i have kickin around. Bottom rack is salvaged BBQ grill and the rest will be expanded metal. I am using angle iron from an old bed to support racks. I am going to side it with barn wood siding from a 150 year old building on the parents farm. (it's falling down so I am not destroying it) In total it is 7' tall but I am going to cut the propane bottle chamber done about a foot making it 6'. This project is made with 100% salvaged materials (and leftover tile adhesive from bathroom reno) costing me nothing but time. My question for you all is what should I use to season and first cook in this? I will add more pics as I progress.