Welcome to b-p.net!
I'm one of the few and loud "glass" people here, so the aesthetic of a nice looking vivarium for my pet snakes is important to me, as it sounds like it is for you. =)
I'll echo what everyone else has said and get two identical hides. My favorite manufacturers for pleasing looking hides that are easy to clean and work well for BP husbandry requirements are Hagen and Zilla, especially Zilla's "rock den" series. I have my corn snake, ball python and boa constrictor all with Zilla rock den hides and all 3 pretty much live in them. =) I would assume you should be able to get these in your local good reptile shop.
The half log hide is crap. Pitch it. =P
Our BP is now in a 4' x 2' x 2', up from her original 20L, but the arrangement is pretty much the same:
You'll notice that the mouths on these 2 hides are different. I got another hide, identical to the one the right with the smaller door, and replaced the gaping one because even tho the first two were similar, Cleo never went into the one with the big door.
Have a look at the link in my sig for more info on my suggested glass viv setup and lemme know if you have more questions. =)