That's great. Have fun playing.
"The dulcimer sings a sweet song."
I have studied the contruction of the McSpadden and hopefully the construction blocks remained the same from the 70's to now. Sounding on the toe indicates a possible space however so I will drill a micro hole into that tomorrow. The neck is solid but I think I might use a slip strap on that if it will feed under the strings. The Scroll head has some spacing differences from the new scrolls. Will check further tomorrow and still may drill it. Have measured, sounded, scoped there is a full block on both ends. Drawing up diagrams now for placement. It is going to be within millimeters, to miss a "stay" or something more solid in the neck, and not overshoot the block on the base, while still accessing the hitch pins. And I am using oval buttons. Now if I only had an xray.
I installed one on a similar instrument. The one on the scroll was on the bottom of the scroll with the screw pointed more or less towards the nut. The bottom edge of the button was just above the scroll/bottom corner. There are 2 options for the rear one, on the side of the tailblock facing the listener, the other option is more difficult, re-position or share the anchors, and place the button between the anchors.