' Wrote:So we have to first collect comudity and build type 1 then destroy the type one and then gather comodity to be able to build a type 2 or 3 ??????
No, just build whichever one you want. If you already have a type 1 and you want to replace it with a type 2 or 3 - you've to destroy it and start over. It isn't possible to convert them from one type to another.