You may want to try TinkerCad as an intro to creating 3D files. It's a web based 3D design tool that has all of the basic function you'll need. The interactive tutorial is top-notch. It's by AutoDesk (the makers of AutoCad, 3D Studio Max, Maya and more)
www.tinkercad.com
It seems Norton may not know what it is and is giving a false positive. You should be able to whitelist the file in Norton. If you are still uncomfortable and want to check, try scanning it with either MalwareBytes and/or Kaspersky.
Thanks. Have those already. All the links from papercraft museum point to the now defunct mechwarrior3.org site.
The models still needed are:
Crates by Vlmarshall from MC2
Linebacker [skins] by Monkeyrum for Punakettu's Linebacker.
Locust by BLaaR from MW4 Mektek
Attack Helo by Vlmarshall from...
I've noticed several spambots signing up and posting in the introductions forum. Adding a simple question & answer to the registration form may help prevent it.
I just started using zip dry for papercraft projects. It's rubber cement, but in a convenient squeeze bottle instead of having to brush it on. I find it works really well for smaller areas (tabs, etc.) but I still use PVA glue for larger areas.
The zip dry does dry pretty fast so you can build...