I won't be using the balsa strips from the older kit. they'd be a little hard to fill.
New strips were cut from basswood.
The ends of the strips are cut to a 45 degree angle.
TIP: To make sure all the cuts were consistent, I drew up an angle guide on my cutting board.
A single edge razor blade was set over the angle and the ends cut.
It's hard to get the cuts straight.On the left it the first cut, on the right is the same end after sanding square with a block.