Ion engines for a Moon mission? That's a bit of overkill, you don't need so much efficiency. After all, killing 110 m/s is a piece of cake for a Grasshoper.
When I was making my first suborbital flights, I was experimenting with sandbox mode. When my capsules re-entered, they didn't slow down at all. This happened about five times before I learned to keep "No drag" off.
I was building a mars space station, but I accidentally put one module on a clockwise orbit, and the other one on counterclockwise. The problem is that the orbits were so similar, that when I was approaching the first one with the third module, I saw a white blur smacing into the module I was docking to at 2x Orbital speed. Both ended up as mars surface debris
Another time I was landing on Europa, I got an Jupiter encounter + Europa encounter. When I was performing the capture burn I jettisonned a pair of boosters. Later I noticed they got a close saturn flyby and achieved way over escape velocity. Then I remembered that they had the only landing legs on my spacecraft.
Ion engines for a Moon mission? That's a bit of overkill, you don't need so much efficiency. After all, killing 110 m/s is a piece of cake for a Grasshoper.