I can't fix for this to be a closed polysurface

I’m not very used with rhino, but I did this model and I want to make it a closed polysurf, but don’t knwo how to fix.00.3dm (1.2 MB)

00mj.3dm (223.8 KB)
I have extracted a few surfaces, recreated and joined to a solid.

ShowEdges will show you where naked edges (gaps) are.

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Thanks for the help!