Thought it was time I make a topic for this matter seeing as how important it is.
I'm aware that it has already been discussed but sadly, it has been forgotten to some extent.
Story: It all started with an user named "Mr. Jago" who used to work on a mod called GTA 3D (a mod which has the recreation of the alpha/beta version as its goal). One day, he was browsing the Capital Autos website and the thought of trying out a new word combination lead him to some unlisted links. Sadly, the index was locked and all that people were able to find has been found through simple word combinations or GTA 2 vehicle names.
The reason I brought this up yet again is because this deserved its own topic in the first place and the fact that a greater community effort could possibly get us more renders (thanks to the matter being in the spotlight yet again).
Here's an image dug out by Vadim M.
Here you can see that we only have around half of the existing renders. It just shows how much more there is to it that we have yet to see.
I have outlined a few of the renders seen in this image to show what we know and what we don't know. Green outline - Unknown; Brown outline - Possibly known vehicle;
Here's hoping that we manage to find more links or gain access to the index somehow - or any other way of getting more renders for that matter.
Been searching random word combinations myself but then I realized that only a community effort can get this done. Thanks.