Yes, you can. It's extremely feat intensive, you'll basically need fighter levels and possibly flaws to get everything you want in reasonable time. Keep in mind you also want the entire archery feat tree (PBS, Precise and Rapid Shot, Improved Precise Shot, Manyshot if you want Improved Rapid Shot...) on top of the TWF tree. AND, since hand crossbows do horrid damage, I'm assuming you're a rogue (also the only class proficient with them) relying on sneak attack. So you'll also want Hand Crossbow Focus (Drow of the Underdark) and Crossbow Sniper feats.
Sound imposing? We haven't even touched on items yet! Keeping up on two weapons enhanced is expensive, and you also, like all ranged rogues, need a ring of blinking in order to reliably get your sneak attack. And that's not even getting into the cost of a magic item to actually be able to reload the two and still fire both that turn. For that, you're basically looking at the grossly overpriced Glove of Storing...x2, cause you'll need one for each crossbow. If your DM is nice, he'll allow the Gloves of the Master Strategist from Ghostwalk which work just as well but are ~1/3 the price. Chances, are greater, however, he'll see your (in actuality extremely weak) build and think it's cheesy, and not be so cool. Oh, gloves is also the only slot you can get a dex bonus on if not using MIC, so you're going to be paying 1.5x for those gloves of storing. Hope your DM uses MIC!
...Have I made my point yet? Yes, you can do it. But it is very, very difficult to pull off well.
