Yes that was me. I missed seeing this thread because I was in the hospital at the time awaiting an operation on my broken left arm.
The Estes Mars Lander you linked to, that was a pretty good price for the Estes kit. But I did not need an original Estes kit, the Semroc reproduction is fine for what I want. I finally ordered one from eRockets yesterday, should be here midweek.
I won't be able to actively build on it till my arm is much better. But I will be able to go through the parts and see what pieces I may want to modify or upgrade, and plan to obtain such parts or material. And perhaps draw some things up on Computer (I use my right hand for Computer mouse cursor stuff, so I can do that well enough now).