The abstract needs to be written more clearly. Add photos and make sure they have captions.
For your how to build sections: use https://www.appropedia.org/Template:How_to. See examples https://www.appropedia.org/How_to_build_Geared-Up_From_the_Feet-Up or https://www.appropedia.org/Poly_Pod_Instructions for examples (also https://www.appropedia.org/Onderdonk%27s_Box_Instructions !)
For your cost table, here's an eaxample and make sure the decimal points line up, see https://www.appropedia.org/Help:Table_examples#Cost_Table
Consider including poster as image near top.
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