Yes, as long as you get the discs from the MHSV1 section of the store and you're not trying to put it into a V2 hilt. Ultra Sabers are MHSV1 compatible, or at least partly. For the single piece hilts, where just the pommel is removable, the back end is MHSV1 compatible, but then the inside narrows down a ways in. But, there's enough room for a battery pack, sound board, etc. You can build a chassis out of MHSV1 chassis discs to go on there. For hilts where both the emitter and pommel are removable, the entire inside of the body conforms to MHSV1 standards, so you can put a chassis in there as well. There are a few hilts (the Bane, for example) that aren't fully MHS compatible, despite having a removable emitter, but the store pages say if they're MHS compatible, and which parts are. IE: it will say "Removable pommel (MHS compatible)" under the Item Description section.
What about V4 hilts? I'm interested in getting empty Sentinel LE V4 hilts to build 2-3 sabers, and I'm hoping to include crystal chambers in the chassis. Will the V1 and V2 stuff from TCSS not work in the V4 sabers since the hilt's description says that only the pommel is MHS compatible?