impractical, because too small and too large ...

Previous experience:
I have two 5in1 delamx folding reflectors. a 55er and a 107er. to the right stand and the holder. with this I have already optimized many photos, the system works very well.
in a week-long portrait-photography workshop I worked a lot with gold and silver, but also with transmitted light

Experience with this huge reflector:

project
I photographed and released a Santa Claus in front of green. on YouTube there are instructions on how to do it professionally (color range and edge).
The project was OK, but not optimal, because ...

establish
the reflector holder of Delamax only fits on one page, if one turns it pure. nmicht in the second with the best intentions. because the metal frame is 14mm wide, with only 7mm Delamax. with terminals from the hardware store (about 1-3 euros) could help if the reflector is on the ground. it keeps wind must go but no, everything else falls. there is an appropriate holder of w. but both together is relatively expensive.

while I myself the 107 can set up outdoors so that it be light wind stops and I can adjust the tilt so much that I do not need assistants, that will not do here. establish maximum so that it does not tilt, but tilt a reflector - only with Assi. the W. Holder also acts just as if you could place it vertically and therefore could not be used as reflector holder, but since I can not judge, but it is highly like that.

Size as background
the reflector is used as a background too small. because the substance does fold, so you should have, despite an open aperture at a greater distance to the model (also because of the shadow of the model). But then the HG is too small (for a standing 175cm Santa Claus). side it comes sosolala, is not a lot of space. in the base area you can also see the black border and the shadow on the ground, so no real alternative for roll - unless you only makes head portraits.
only the inner part - by light - is relatively wrinkle-free.
with feeling one can the film smooth iron and then rolled up or can at all always spanned ... but that's not the actual idea a folding reflector. self-straighten the wrinkles can not or hardly, at least not within a few days, something better would it be all right.

Size as reflector
certainly more than adequate and very effective - but for that you need an assistant. but you can safely from a distance brighten very large area, so you can illuminate eg whole objektbereicht (eg doorway).

I'll get me a background two tripods with an Hg role.