Roman blinds

Roman blinds, ladies and gentlemen. Am I up to the task of creating a more effective cold and draught block on the front door than the current venetian blind which only covers the glass panes on the door, not the whole door?

Myself? Using instructions like these? I'll need to get something out of the library to stare at for a fortnight at least. We do want an insulation improvement and paying for them to be made is absolutely out of the question financially. Something like the picture below would be very gorgeous except obviously we wouldn't put the couch in front of the door. The wolf ain't knocking that hard yet (I'm not the only one who grew up with a Dad making comments about the wolf being at the door when referring to hard economic times am I?).

I'm planning on having a good look through the remnants bin at our local curtain shop (yes we still have one and by crikey I'll be supporting it rather than go online or mail order). I doubt I'd be able to get a remnant large enough and I need to learn lots more before I'd know whether I could sew several remnants together and still get the blind to hang properly. Our home is not beautifully decorated and nothing has to match particularly. If I see something totally gorgeous in a small piece perhaps I could just use that with plain stuff above and below it. A splash of gorgeous is something I like a great deal. Just doesn't have to align with everything else in my world.

I'm not sure I should even be having such adventurous thoughts. But it does sort of look like if I measure things properly, the actual sewing might be straightforward. I'll ask my tutor at the sewing class on Thursday night. Assuming I remember to sign up for it and pay tomorrow. At least everyone appears to have had chickenpox.