Today I started Step 3. Despite the 96+ heat & humidity outside and a couple of mishaps, like dropping my portable miter saw and breaking off one of the legs, belt sander schredding its last belt, realizing I gave away my old circular saw ( when I didn't find it in the last place I looked ) and haven't bought the new one yet, I somehow still managed to cut out the arrows with a cheap HF jig saw and sand the top edges of the cut smooth with a cheap HF hand held belt sander.
Here's one of the arrows dry fitted with the top trim. I'll trim the ends to size and add the small vertical pieces to match the design of the decal. Meanwhile I picked up some orange paint at HD with some chain and hooks, etc to hang the sign from the ceiling when its done.

