More trade slots for gold coins

As a trader , i always make my slots full with offers and still want put more offers . I suggest to team that they should let us put more slots ( for gc )
At the moment we can only buy 11 slots for coins each with 4 lots . How we should get more slots :
- leveling trade office : max level of building should be 5 , how we upgrade it : - with trader medal and saltpeter ( trader medal would be something new in this game and saltpeter would be used more )
How you get trader medal ? From missions . For example : - make lvl 30 and own an small merchant statue on your island ( reward - 1 medal )
- make lv 48 and own merchant statue on your island ( reward - 10 medals )
The prices of upgrade should be :
Level 1 : 200 pinewood planks and 200 stone ( that's the build cost , so if you build it it means you have it level 1 )
Level 2 : 1 trader medal and 5k saltpeter ( after you build it , you can upgrade it to lv 2 )
Level 3 : 3 trader medals and 15k saltpeter
Level 4 : 5 trader medals and 30k saltpeter
Level 5 : 10 trader medals and 50k saltpeter

PS : Sorry if i said something wrong in english .
Still thinking at more questions !

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Hello Amorp,

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Thank you,
Fexno