Lightweight fusible - check.
Press seams open - check.
Just using sashing- HORRORS!!
Look at some of the regular quilt patterns that use big blocks! So much more creative! I used a BQ pattern from Maple Island quilts and mine turned out great! Here's a link to mine, I later added a border of the Mizzou fabric.
http://www.quiltingboard.com/t-126291-1.htm
I used the pockets from a hoodie to use as a pocket for your tv remote. Just make sure you don't quilt it closed!

I was at the Quilt Expo in Madison, WI and there was a person in a booth demonstrating the 606 spray adhesive. She used it on the back of the sections of the tshirts she wanted to use in the quilt, cut them out and then ironed the pieces on a large piece of black fabric....no sewing and the effect was so cool! I bought 3 cans of the stuff for not only tshirt quilts but banners and applique! The 606 spray is permanent, the edges of the pieces do not ravel.

Which BQ pattern did you use? That's a great layout!

I haven't seen an answer to your question yet, so I will try. Heat and Bond that I have bought is more like a Steam-a-Seam or Wonder Under product that is used for applique (sticks it to the main fabric).
A stabilizer is used to keep the t-shirt from stretching all wonky when piecing your quilt. That is why you place the stretchy sides of the stabilizer in opposite direction of the stretchy sides of the t-shirt. There are different types of stabilizers used for different purposes--one instance is a paper-like one that is used behind machine embroidery or satin stitching.

Okay--that is about the limit of my experience with these products. Anyone with more information, or a better explanation, please feel free to jump in (or correct me if I'm explaining it wrong).

HUDGODDESS loved your quilt. What is a BQ quilt? I am sure everyone LOVES your T shirt quilts!!!!

I used the nylon from a soccer shirt and it worked well. The hockey shirts have those holes in them (at least my son's do) so I guess that I would put a t-shirt or cotton square underneath it.

As far as quilting them, if you use 9 inch blocks and batting that only needs stitching every 10 inches, you can stitch in the ditch.

I am on my 3rd t shirt quilt i use any brand but if the shirts are stretchy use a heavy one

Went to a quilt show over the weekend and a lady did a demonstration about T-shirt quilts. Yes, use lightweight fusible interfacing, and she make all her blocks 12" and had sashing between each block. If you use part of the T-shirts that aren't large you can combine smaller pieces on the fabric that you use for sashing so it all matches. Hope this makes sense.

I didn't use any fusible on mine because I didn't like that feel. I just used a piece of thin muslin-like fabric from taking a bedskirt apart. It was the top fabric.
I sewed the t-shirt sections to the fabric and had absolutely no problem with it at all.

Pellon Shir-Tailor (950F) works great. It is a fusible stabilizer about 20" wide on the bolt.