Hi, Melissa - Thanks for the link! Just a couple thoughts on linen twill and a bit o' warning:
There's linen twill, and then there's Linen Twill. It's pretty common for linen twill that's made for upholstery to be sold as twill for hand embroidery, but the fabric is completely different. The upholstery fabric will be thick and seem almost spongy, and the weave between the diagonals tends to feel loose. Linen twill woven specifically for hand embroidery is a much tighter twill, it's "fairly" light (not really light, but lighter than twill made for upholstery). It's usually a very firm fabric, and more delicate than upholstery twill. And it works well as a ground for all kinds of needlework - from crewel to goldwork.
As far as I know, there are only two real linen twills made specifically for needlework on the market (or at least, easily available) - Legacy Linen's, and the crewelworks company's (Philippa Turnbull). The latter is darker and slightly heavier than the former.
Not trying to be preachy

, but just so you know, so you can keep an eye out for the right stuff. And this may very well be a good linen twill made for needlework. It wouldn't hurt to ask them who makes it, though, before investing in it.
MC