do it all the time on rough sawn lumber that is worse that what you get out of a bandsaw
That 12" jointer should eat that wood, start out with depth...
add a gravity damper to an outside wall so that if the area goes negative then it opens as much as needed to make the air up. too much exhaust not to...
sealed burner, vented propane oversized to twice normal as you want to quickly bring the space up to comfort. 2 heaters or one variable rate of fire....