Siam as a (German) Colony

Some time ago I was reading some book that made mention that the Germans were interested in turning Siam into a German colony but the plans never got anywhere because the Country was able to modernize itself or something else. Personally I've never heard anything else about this anywhere else so I'm doubtful about this.

Now basically I have severally questions about this.
1. Were the Germans actually interested in this?
2. If so could they have succeeded or what would it have taken to accomplish?
3. What would the effects of A German colony of Siam have during WW1?
4. Taking 3 into account the Germans lose ww1 so what do you think would happen to Siam?
 
It's a bit tricky- a major reason Siam was able to maintain independence was because it was right between French Indochina and British India/British Malaya. The Siamese kings were able to play both ends against the middle and function as a buffer state. Basically it's in Britain and France's interests to keep Siam independent and attempts by Germany to take over would disturb the balance of power in the region.
 
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