What was wall tile on? The reason I ask is you need to figure out the projection of the shiplap to the window and door jamb. If the shiplap is proud, or out further than the jambs, you need to make up jamb extensions. If it is shy, you need to pad out the studs. Take a four foot level and place across interior of window and door. Measure distance to studs. That number minus thickness of shiplap is what you need to figure it out. Shiplap is usually 3/4.
The ideal numbers would be 3/4 (just install shiplap to studs), or 1 1/4 you would skin the walls with 1/2 inch plywood which would alleviate the need of using just studs for fastening
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