That's really looking good!
I just followed the link you provided to the LUT's site to see if he had any pix of the finished product, and to compare whereabouts you are regarding the finished product and ... YIKES!! I was blown away by the detail he's included in the 'model'!
I'm pleased to see no warping in yours and it looks like you've got a really good framework going, on which to build all those coming details!
Is all the piping done in paper too? Do you think you'll use the kit parts or replace 'em with styrene rods or tubes?
Man oh man, I'm looking forward to this more than I was before!!
Just keep doing what you're doing!! And thanx for posting!