Kudos for getting Heavyarms. Always struck me as the most underrated of Gundam Wing's mecha (my friends in highschool all seemed to prefer the rest of them), but always remained my favorite.
Wish I had more time for model kit stuff. Dorky as hell hobby, but it's always fun and satisfying. Just takes freakin forever if you plan on going all out (with paint and glue and sanding and all that).
Honestly, it was probably my least favorite behind the Sandrock. Making the bullets and constantly reloading the thing with more and more ammunition between every battle seems like a design flaw. It always runs out too, at which point all it can do is use its fold out knife weapon. As Gundanium in Gundam Wing is practically invincible against anything not a beam saber, the Epyon always seemed like the one I would want to pilot the most. But yeah. It's all SUPER geeky. But who cares?
I think the best thing about Gunpla though is that there are wide ranges of complexity and grades. You don't need to invest in a 1/100 Master Grade to enjoy it. Even the 1/144 High Grades can be fun on a budget with limited time. I would suggest the Char Zaku HG that came out recently for starters. All it really needs is a black gundam marker for the panel lines.
https://www.amazon.com/gp/product/B00T41F4P2/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1