The position is determined when you placed the order, not when your payment arrived
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If all goes well, there will not be a huge gap (if any) between the batches.
With 250 delivered, I can pay and order the next batch.
And we WILL need some time to assemble these units, so it could be the next boards will be finished when the remaining 250 from the first batch have been delivered.
Money is really really tight, as everything did cost a LOT more than I expected (and I calculated in 100k EUR as safety - due to the issue, we got over that!). It won't be easy, but everything is manageable