I think you're good, if all is snug. Give it a test ride.

Chainline - if you look at it from the back and the chain looks basically straight, and it's not snaking excessively, it should be fine.

If you want to measure it, typical spec is 43.5mm from the center of the seat tube to the center of the chainring for a single, or 43.5mm to the point halfway in between the chainrings. You can fudge this a bit, especially since a double is being used as single.