I've been building for 14 years, since I was 5, and basically non stop since then. and there's always a kit in my college dorm. I've been building for so long its apart of me. my parents used to pay for eveything but then when I got a job I started paying for everything. all my firends don't care about me building. its a great way to relax,
The second model I ever built looks like shit compared to yours, but I think you've gotten a little overzeolous with all you decided to put into it. resin at times can be completely different to work with styrene. also, cutting open hoods, and removing bumbers is not easy to do, becouse it requires alot of patience, and a real steady hand,
SAS resin transkits look very good, and i've seen alot of resin kits, some shitty one's (R&R Vacuumcraft)and some insane one's (Modelhaus), SAS are Extremely well done. but there really not intented for unexpierienced modelers.
The Tamiya 350Z is a fantastic kit. great for beginner modelers, but you may have gotten a little over your skills with all your putting into it.
also, yellow paint is hard to do, becouse its hard to get the pigment of the yellow paint to stick to the finish, I can't tell you how many time's I've painted a kit yellow and it come out like that, I recommend warming the paint for about 5mins in hot water. it allow the pigment to stick to the body