It can be done either as QAYG or have it LA. Yes it will be very heavy so if you do QAYG make sure you have a nice big area to support the quilt as you assemble it. Additionally, be careful with QAYG, some of the T imprints are very hard for some machines to get through. If you have a workhorse machine you should be ok but some of the newer, less expensive machines will have trouble with it.
I have done a double sided one on my LA and it was fine. I didn't make it though, it was a client quilt. I did, however, just take a commission this weekend to make one and I am going to do it double sided.