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Sorry, I forgot to mention:

You can udgrade your repair base, you will not need to build a new one.

There suppose to be a green arrow around that building. If you tap that, you will be able to see what it costs and what items you need to collect.

The left pic shows the current level and in the right you will see the upgrade.

Tap the box pictogram, a list of items will apper that you need to upgrade.