Figuring Out a New Building Strategy

Today I logged into Second Life after deleting all my plans for my theatre.  I really wanted to start from scratch and see what I can do in order to make mega prims, which are prims that can stretch over 10 meters.  If I had that, then I will be able to make all my walls to my theatre with only a select amount of prims.  I couldn't figure it out so I went into Second LIfe thinking if I could manipulate a bunch of 10 meter pieces into a giant wall.  I started making too many prims again.  I ended up getting a visit from Ann again who signed in as "Builder Flux." Her avatar looked like a big headed alien that was a tourist.  She was basically regulating how many prims we are using, but was also offering advice on what we should do with our individual projects.  She started to take a prim and stretch it to around 64 meters.  I was extremely surprised with how much ease she was able to stretch the prim that far after I have been researching forever on how to do that.  She then asked me to stretch the prim to that length but I was unsuccessful, only being able allowed to stretch it at the maximum of 10 meters.  She was surprised and intrigued why I wasn't able to stretch it so much so she was making sure all my settings were correct in the builder's pallet.  I told her everything was correct and she couldn't help me wondering what may be the problem.  She unfortunately had to get running so I wasn't able to get what I needed.  I'll just have to see her next time when I'm in class (to see her in person).  What I've learned about Second Life is that it may be easier to get help from someone in real life if they are physically next to you while you're editing in Second Life.  I looked towards the internet to see if there was anything else I could do in order to find how to build these mega prims.  I searched for so long and no luck.  I have to wait for class I guess :(