>>6300101>scratchbuilding something by following a guide>paying $70 for said guideI think you are missing the point.
Scratchbuilding is all about following your imagination, besides you can tell what was scratchbuilt just by looking at the picture you posted.
Your $70 would be better spent on a few cheap HGs and a "variety pack" of plaplate. If you need inspiration, Google custom builds, it's free.