Some quick tips:
- Blender > Object Creator (Although pretty much anything is.) It's worth learning to expand the possibilities in NL.
- The twisted tower track shaping is very inaccurate. Some photo reference:
http://rcdb.com/1920.htm?p=0 (You can also use Youtube videos as references to help you make the track more accurate.) Newton 2 or FVD++ may be able to help you out here, but if you insist on handbuilding, you'll need to take extra care to ensure the track is accurate, but even then, will still get inferior results to Newton 2 or FVD++. I suppose AHG is always another option, albeit a bad one IMO.
- Supports need to be thicker. You can specify custom beam diameters if needed: this thread may help:
http://coastercrazy.com/forum/topic.asp?TOPIC_ID=24427
- The flanges and bolts arguably use too much geometric detail. Using a texture and fewer sides on the flanges would help.
- For adding Wild Thing: There's always the NL Construction Kit, which is now free.
Good effort on this so far. There are flaws around, but you're obviously putting some time and effort into this. It still needs a lot of work however, to reach 8.5-10 rating tier. (I'd probably give it a 5-7 right now.)