No need to redraw anything.
You find the open vectors in 5 seconds or less by going to the Edit menu, then choose Selection/Select All Open Vectors
Now you’ll see the 3 open profiles selected. Now you can select them one at a time and click the “Join/Close - vectors by moving end points to common point” icon. (Note: pressing “J” on the keyboard will join a couple of those but not the third one. In case anybody was wondering!)
After that, you should be able to calculate your profile cuts with no problem. Holler if you still can't do it yourself. I'll post the corrected file if needed.
-ShopBot Buddy PRSAlpha CNC