This is the RX-78 GP02a from Gundam 0083: Stardust Memory. It's a Level 8, English-language, model kit. It's made from a few hundred pieces, and took several enjoyable hours to put together. It's fully possable and has various accessories. I don't have it posed with the shield that comes with it (just as tall!), just the huge (nuclear bomb) cannon.
It's an MG version. I have about a dozen Mobile Suits built, but seem to have run out of time recently for more. This is the latest one I built. Back when I had more time I might've added more detail with Pigma markers; but this GP02a is as-is. Thanks for the comment.