We ended up spending about $100 on the boards and trim, another $100 on the shiplap and another $100 on caulk, paint and paint supplies.
If you are familiar with board sizes, youβll know 6.5β³ was a little disappointing of a gap because boards come in 2Γ6 or 2Γ8, so we had to size up and bought two 12β² long 2x8s and Brad had to βrip themβ on the table saw down to 6.5β³ to fit in the gap.
The last piece of trim that Brad added was a 1.5β³ trim strip (he wandered around Home Depot looking for something exactly 1.5β³ wide, which is exactly the width of the sides two bookcase that are butted up against each other).
Basically to hang shiplap, draw out where all of the studs are along the wall you are covering, cut the shiplap boards to the size of the wall you are covering, and use that handy dandy finisher nailer I mentioned above to nail them up in place.