I landed on Duna. Don't worry about what Jeb's doing. He's just examining what seems to be a hole in his spacesuit.
The lander has a descent and ascent stage like the LM. The descent stage has a bunch of Oscar-B tanks and an FL-T100 tank, powered by a Terrier engine. Slapping a bunch of Baguette/Dumpling/Doughnut tanks on a Spark engine makes for a pretty good ascent stage.
The descent stage has about 1200m/s Δv. It's just enough for a deorbit burn (from like 190-200km or something) and landing without any parachutes. Jeb landed somewhere near the South Pole. The ascent stage has more than 3300m/s Δv. The mothership in orbit has about 1000m/s Δv left I think? I may or may not have to do a rescue mission. I'll definitely have to refuel the mothership with the lander's fuel.
About that, the ascent stage has about 1300-1600m/s Δv after reaching.... some kind of orbit, I don't remember that much from my test runs. I haven't tried reaching orbit just yet, both stages of the lander are still on the surface. The ascent stage has a TWR of 1.2 when lifting off from Duna's surface I think.
The lander is better designed than the rest of the payload and rocket that sent it to Duna. I put an antenna on the lander that should be good enough for contact with the mothership. But the mothership doesn't have any antennas on it so it was useless. Here is the mothership:
The thing on the very bottom of the picture, next to the Mün, is the discarded aforementioned Rhino stage. And now the rocket:
I present to you the Döner IV.
Its first stage is the 2 Twin-Boars on its sides. Liftoff TWR is about 1.2. The second stage with the Mammoth engine has TWR of about 1.7. The Rhino upper stage takes the rest of the payload to orbit. The Döner mothership has 4 solar panels. It is powered by a Poodle engine. The command module has 4 main chutes and 4 drogue chutes. The LES on the very top of the rocket is completely useless aside from aesthetics and aerodynamics reasons.
If you're wondering about I, II and III...
The Döner I was used to send an orbiter to Duna and Ike. The second Döner was used to land a Kerbal on Ike. There was a variant of the Döner II, the Döner IIb, which ditched the lander entirely. The third Döner was a failed attempt at getting a Kerbal on Duna's surface and back (never went anywhere close to Duna's SOI.) All of these rockets were built in career mode. This one was built in a sandbox save.