Dipstick, I removed your email address. If you have additional ideas please share them in the thread so others may find and learn from the information as well. Plus it keeps you and our other visitors a little safer.
Creating a multi-version W7 installation USB flash drive is fairly easy. But to edit it and add other applications/utilities would be a lot more involved and I can't help you with that part.
To create a multi-version W7 Installation USB flash drive simply download the
W7 SP1 ISO, use an ISO editor to remove the ei.cfg (see
getting 4 versions thread), then use the bootable
USB DVD/Download tool. Note, you still have to choose either 32 or 64 bit, I do not know how to create a multi-bitsize version