There are many good threads containing various rocket designs some which talk of the SDV and of others.

Rocket Business model for shuttle delta IV atlasV, and others good or bad
http://www.newmars.com/cgi-bin/ikonboard/ikonboard.cgi?s=9cfba071b3fcc1bf53542ee656ac6514;act=ST;f=4;t=418;st=0

Cheap heavy launcher, can it be done at all
http://www.newmars.com/cgi-bin/ikonboard/ikonboard.cgi?s=9cfba071b3fcc1bf53542ee656ac6514;act=ST;f=4;t=420

Might Shuttle C, save Hubble
http://www.newmars.com/cgi-bin/ikonboard/ikonboard.cgi?s=9cfba071b3fcc1bf53542ee656ac6514;act=ST;f=4;t=290

Post central for information on CEV, iformation station for the spacecraft
http://www.newmars.com/cgi-bin/ikonboard/ikonboard.cgi?s=9cfba071b3fcc1bf53542ee656ac6514;act=ST;f=4;t=255

A proposal for a Heavy Lift Vehicle was made in a study from Caltech called 'Mars Scheme' back in 2022 called the Z-5
http://mars.caltech.edu/marsscheme/marsschemenoanims/marsscheme.htm.

Basically a Saturn V re-do, using 5 x RD 170 engines to replace the 5 x F1.
4 x Vulcain engines for the second stage to replace the 5 x J2 engines.
5 RL-10D engines for the third stage, for direct flights to Mars.

I guess the second stage could use RS 68s.

Their report - http://mars.caltech.edu/chris_its/msm_10/abst_toc.PDF said that re-usability only became viable when launches reached an (un-specified) number per year.

A heavy Lift vehicle is probably not necessary for the early Lunar stages of project constellation if multiple launches of Delta and Atlas are used for LEO assembly. Once it was known what form the Mars expeditions would take and how often the trips were to be undertaken the Heavy Lift Launcher requirement would speak for itself, ie Expendable (Z-5) or an Energia type of vehicle.

If no humans were to be launched on the heavy lift vehicle, but were to rendevous in LEO with NTR propelled space ships launched by the HLV then development and handelling costs could be cut considerably. Once again space stations could be launched in one shot. These for research, repair and servicing space infrastructure,re-fuelling and of course tourist hotels.

Hi.....Well it seems that September 10,2026 is going to be the test flight of the Boeing Delta 4 heavy...if all goes as plan,we'll see a lift-off that we haven't seen in 30 years !!!Slow and majestic.Also on a Boeing site they show configurations of up to 6 strap-on liquid fueled boosters..That could put the Delta in the same catagory as the Saturn 5...If that happens and the flight on Sept.10 is a go and all things work..NASA may have it's heavy lift vehicle ready and possibly man rated sooner than anyone had anticipated..Also additional word is that the Shuttle-c would be used in conjunction with the Delta 4 heavy for orbital contruction flights.....Jake

Apollo Inspires New Moon Rockets, two teams at the National Aeronautics and Space Administration are studying booster rocket design concepts.

One team, assembled by the space agency's Exploration Directorate, has been examining rocket designs from the top down, according to Michael Lembeck, who heads the directorate's Requirements Division.

Second team at NASA's Launch Services group is conducting a bottoms-up review, meaning the services group, which purchases launch vehicles for NASA missions and payloads, is accumulating background on and analyses of all available U.S. boosters and their capabilities.

http://www.spacedaily.com/news/rocketscience-04x.html

Boeings plans for Heavy Lift are taking shape. See Links

http://www.boeing.com/defense-space/space/bls/d4heavy/flash.html

http://www.spacecongress.org/2004/Panel-4/2Collins.pdf

Thanks to the Orbiter Simulator Forum members for finding these.

http://www.orbitersim.com/

With this I've been flying the CEV already :-)