The constructor ship you get free is a unique ship, in that it only can build the URV station, and is the only constructor that can build said URV station.
Because of it's uniqueness, it can be found easily in the save_file. Search for "units_size_xl_builder_ship_plot_01_macro" (verify it has owner="player" on the same line).
A few sections below that macro line is the 'resources' section. This is not what the ship has in stock, but what it needs to start it's current task.
This is what I have for the third section of the URV station:
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<resources>
<ware ware="energycells" amount="672"/>
<ware ware="fusionreactor" amount="52"/>
<ware ware="reinforcedmetalplating" amount="262"/>
<ware ware="bioopticwiring" amount="48"/>
<ware ware="shieldgenerator" amount="12"/>
<ware ware="dumbfireturret" amount="2"/>
<ware ware="machinegunturret" amount="24"/>
<ware ware="plasmaturret" amount="12"/>
</resources>
Copy that block (whatever the numbers may be, they will be different for each stage of the station) to a blank file so you have it without searching for it again.
Now, you need to find the constructor ship's cargo hold. Hopefully, you have a good stored in the constructor ship already that you can search for (like energy cells) because the cargo hold is about 10k lines below the resources section (the details for the entire station being built are stored between them, apparently).
So if you've got 292 energy cells in the cargo hold right now, search for
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<ware ware="energycells" amount="292"
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<component class="storage" macro="storage_ship_xl_universal_01_macro" connection="shipconnection" id="[0x2d94a]">
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<component class="storage" macro="storage_ship_xl_universal_01_macro" connection="shipconnection" id="[0x2d94a]">
<cargo>
<summary connection="cargo">
<ware ware="energycells" amount="672"/>
<ware ware="fusionreactor" amount="52"/>
<ware ware="reinforcedmetalplating" amount="262"/>
<ware ware="bioopticwiring" amount="48"/>
<ware ware="shieldgenerator" amount="12"/>
<ware ware="dumbfireturret" amount="2"/>
<ware ware="machinegunturret" amount="24"/>
<ware ware="plasmaturret" amount="12"/>
</summary>
</cargo>
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Alternative
You can just 0 out the resources requirement. All those ware='s under the <resources> tag? Change them to this:
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<resources>
<ware ware="energycells" amount="0"/>
<ware ware="fusionreactor" amount="0"/>
<ware ware="reinforcedmetalplating" amount="0"/>
<ware ware="bioopticwiring" amount="0"/>
<ware ware="shieldgenerator" amount="0"/>
<ware ware="dumbfireturret" amount="0"/>
<ware ware="machinegunturret" amount="0"/>
<ware ware="plasmaturret" amount="0"/>
</resources>
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<resources>
</resources>