If anyone is interested i can provide some vSRX and vMX trail images to play with (these are a bit different from the hardware but should give more feeling with the platform)
- First, is it possible to FTP or HTTP files to JunOS?
SCP/SFTP it runs a standard ssh daemon
- Does Juniper offer a SDK/Toolchain to compile your own software?
Not officially as far as i know but it should not be to hard
- Is there an available list of basic tools/packages on a JunOS
instance?
Everything has to go true the Junos commands i could check the Juniper KB
- Is there "Userspace" or command shell (to access the Kernel, not
JUST the router config/show console) available?
You can even use standard tools to modify routing tables for example
- Can you set files as executable?
Yes
- Can you execute files or scripts on JunOS?
Yes you can execute various scripts and utils
- Can you run commands from userspace?
Yes
--- 73 Rudy pd0zry