My unsolicited opinion on scabbards:
Crusader monk can't make the appropriate type of scabbard anyway (integrated sword belts), and his are very ahistorical, so it's a non-issue if you're looking for a historical scabbard.
DBK stuff is very nice, not my cup of tea for a medieval aesthetic (his stuff looks way more American Southwest to me than medieval), but his skill in leather is pure artistry, but a year wait is too much for me.
Christian Fletcher has a much quicker turn around time and is a big step up from Crusader Monk, but not quite as nice as DBK. However, CF uses a lot of modern hardware.
The only 'production scabbard' guy I know of that makes real medieval 'looking' scabbards is Todstuff in the UK. Leo Todeschini really nails the medieval aesthetic. His stuff is a pretty penny though, and would require overseas shipping.
I think Jeff Hildebrandt at Royal Oak is going to start dabbling in scabbard-making, and without ever seeing one by him I'm willing to bet he nails it...
I've basically left you with no clear choice for a scabbard, but if I had to pick out of those, I would go for Christian Fletcher for turn around time, very nice work, and if you get an integrated sword belt with thongs, then there's no hardware anyway, so it would appear very historic.
**I just saw you said you'd like to attempt the scabbard yourself... that's probably the best choice. If you've got patience and take it slow, you'll get exactly what you want**