Building a model requires a systematic approach, firstly a design concept, preliminary designs, a budget. After this primary stage, the design development can take place and realictic cost for materials, labour and timeline to build this model can be achieve.
Building a model requires a plan, some guidance and a lot of patience.
I'd have to say most important is knowing what you want in the end. By creating or finding a clear picture of what you want, you make getting there so much easier. The cost of not doing so is it takes more time to complete and a better chance of failure through loss of interest.
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