Welcome to the forums!
Kudos on your choice of using an SLG for the LCD monitor. Personally I'd go with a CRT, but you did say you wanted to keep the weight down. However, Nintendo cabinets don't weigh much to begin with since they are smaller than typical cabinets. Something to think about.
The Dell 2001FP is a 20.1" 4:3 monitor. To be more authenic, you'd probably want a use a 19" 4:3 monitor. Check out ArrowDirect.com, they have tons of used ones. Use code ARROW for a discount and free shipping. I love that place..

However, you could certainly use that 20.1" monitor since you're not going with authenticity (after all it is an LCD).
As for the color: Radarscope Red is a great choice. (I'm biased, since that's what mine is going to be). Are you planning to laminate or paint?
Emulation: I didn't see DK Pauline edition on your list, it's a fan made "reversed" DK clone where you are Pauline saving Mario. DK Remix is not emulated. Although you can get the Coco3 emulator and play that version instead (it's pretty close).
Hope this helped and good luck!
DeL