What I really need is: How can you get FS1 ships like the Chronos, the SF Scorpion into a FS2 environment - how can you get their
models on FRED2?
Download the FreeSpace Port. Unzip it into a folder within your main FreeSpace 2 folder (for example, C:\Games\FreeSpace2\FreeSpacePort)
For FreeSpace Open:
Open the Launcher
Click on the "Mods" tab
Select the folder in which you unzipped the FreeSpacePort. [[If the Port creates ANOTHER folder inside the folder you just created, select that folder instead]]
For FRED Open
Once you have done the above, create a shortcut to FRED2 inside your main FS2 folder (C:\Games\FreeSpace2)
Right click on it and select "properties"
Find the field called "Target"
Add "-mod FreeSpacePort" to the end so the Target field reads something like "C:\Games\FreeSpace2\fred2_open_3_6_9.exe -mod FreeSpacePort" [[Again, if the Port created ANOTHER folder inside the folder you just created, select that folder instead]]
For Retail FS2
Download the FSPort.
Rename your data folder to something other than "data" (such as "datab", "normal_data", etc.)
Create a new folder named data.
Unzip FSPort to the new folder called data. [[If the port creates another folder, just take out the .VP and stick it into the data folder]]
Apologies if this is a crap guide, I'm not very good at this. But it should work.

BTW, there was no Chronos in Derelict, that was an Amazon Advanced with an alternate ship class name (Alt. Name in the FRED ships editor).