I don't think it was the first Skyline mod. There's also the Ibishu Miramar 690/710, the Ibishu Pescoupe, and the Nissan Skyline ER34 (the last mod got deleted within a day after I made this post haha).
On topic, also i will make a model of VD 58 Before enlist, not jbeam it is free to make your own jbeam with this model