Starting a 737 Build from scratch?

Hi,

I am brand new to sim building so what I am trying to build may seem a bit ambitious - But it has to be done!

I am going to try to build a boeing 737-800 home simulator based on the norwegian 737 project

(https://www.youtube.com/watch?v=a3O5E5d_v24)

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I will need to start with the frame first from wood - but I do not know where to get accurate messurements from.

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And while I am building the big project - I found some wood that had been throwen away but in good condition still - not good enough to build the 737 but good enough to upgrade my desktop sim to something more cockpit like .

I guess my question is - how did you know what size wood to cut etc and how did you all get started to learn what you needed to?

Thank you - Lightspeeders