Hi Hal
I just came across this thread when searching the net for the Charger - I got into some nostalgic mood today and just remembered when we all used Ambroid cement (or similar (we had Cemento Aerobrás down here in Brazil) and that reminded me that I built 2 of them, in one of those old Ambroid ads there was a 3-view which I enlarged and freely built over these plans. I modified them to full house controls.
I enlarged one some 20% and powered it with an Enya.19 Controlline engine fitted with an OS Carb, and controlled it with a Graupner/JR Radio.
Later on I built another one, this time in the original size and powered it with an OS .10 and later converted it to electric power using an surplus Mabuchi-Type 550 can motor, from a crashed Goldberg Mirage 550. Radio as always my old, reliable Graupner/JR.

Well, that´s it.

Marcus