Looking at the specs, it’s pretty heavy, but as long as you’re strong enough to pick it up you’ll be ok. I race (I use the term very loosely) desert in the 4 corners region on a 450x and it takes a lot out of me to pick it up when I’m tired. I would make sure you can get a big tank for it before you buy it. Sure is appealing to get a brand new bike for that much money.
If you want to get into Baja, and have a week to spare in April, consider the NORRA Mexican 1000. Less intense than SCORE, but a lot more smiles per mile. Non-technical course, you get to sleep at night, food and beer at the finish line most days, easy to chase, just a blast. This year will be my fifth. There‘s a guy that’s done it a couple of times on a KLX300.
That being said, if you want to race SCORE, I’m putting together an old slow guys sportsman team (no aspersions towards you, just me) for next year’s 1000 and am looking for riders. I’ve done 5 on quads, this will be my first m/c one. Just a thought....