How small can you go?

[Landge]

WooHoo! In orbit over Dres.

I barely had enough fuel. The LV-N didn't have enough to even put a dent in the trajectory but did slow it down.

I had to rely on the Ion drive the rest of the way to get an orbit.

To make matters worse I didn't have enough batteries to keep the drive going more than 4-5 minutes at a time.

I had to keep shutting down the drive until the batteries fully charged.

Next up Eeloo. The last planet left I've not yet sent a ship to.

[ruiluth]

I landed on Minmus with this ship, the Minimus II, which is also 10 parts. It almost returned, but mechjeb screwed something up and i'm not sure my landing would have ended up on Kerbin... When it left Minmus it had about 2000 m/s of delta-v though so i'm pretty confident that it was able.