Hi MagPie,
I am not a moderator but do have a few suggestions that may help you and the poster that is trying to build the 120 g tank stand. In the
DIY section, there are many posts there explainning step by step instructions for building tanks, stands etc etc and there is no problem with posting over there and you will not be taking up the 'room' as you feel concerned about. The DIY section is there for that purpose.
Also, another suggestion would be to exchange your personal email address's with this poster that you are communicating with and then you are both freed from the tie up that the PM on the forum is causing you?
Just suggestions from a fellow fishlore member.

good luck on those plans.
~ kate.