Joining Two Halves

I am currently modelling a mech, and I need a question answered before I actually finish it.

So, I am using the mirror modifier to make one half, and when I am done, I will delete the modifier, and somehow connect the two halves.

That is the question: How do I connect the two halves when I am finished? I was thinking of using the merge tool, but then I would have to merge every verticie down the middle.

Any suggestions?

If you delete the Modifier you’ll delete the mirrored half with it. In the Modifier tab click “Apply” to make the Mirrored half real.

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Thank you very much