[Bing] [Tischbahn] - Unusual Bing Table Top USA boxed set

Late last year I won on E Bay USA an unusual Yellow electric Bing 00 boxed set. The box looked as though it was falling to pieces, and there was some writing on the inside of the lid, but I still decided to try to win it. In the box there was a black loco , with cowcatcher, 2 brown continental coaches, a brown continental wagon, 4 straight pieces of track, 11 curves, and a controlling rail.
When I received the set, I was right in that the box was in a very poor condition, but at least the loco was in working order. The box base had tears down the sides, and all of the blue paper coverings had parted from the cardboard.
This I assume was due to an excessive amount of heat. The box base had dry sticky tape everywhere, holding it together.
The lid had torn edges, and pieces missing, including one complete edge. Again, tape everywhere. What was really unusual about the lid was that it was just plain card. What I thought was the inside of the lid ( with writing ) was in fact the top of the lid. I assumed the lid would have a yellow top, with the Bing label, but it didn't.

Firstly, I removed the inserts from the base and added some new card the strengthen the base. Secondly, I glued back on the blue edges of the insert sides, including the yellow tops, and put them back into the base, using PVA and the box clips. I then replaced the centre sections in their relevant places.
As for the lid, I had a problem in that if I tried to make repairs, it wouldn't look right, with new edges replacing the missing sections. What I decided to do was make a totally new lid, which was slightly larger that the original, and then sat the old lid inside the new one. Once it sat inside, I glued a small overlapping flap to the original lid. That way, there was minimal damage to the original lid. It wouldn't be too difficult to revert back to the original lid.
I've attached some pictures below of the set, and showed some of the repairs, but there are more pictures in a file in the Bildergalerie.

I know that Bing made various box sets other than the Yellow and Black versions, but has anyone come across this before, a set with no covering.? Another interesting point is that from the contents I would have expected the box to be nearer to the size of the Box set 1, not one of this size. The base is clear of any numbering, but to be honest, I didn't expect there to be.

Many thanks,

Geoff.