There is alot of info already on both these subjects in these forums...I don't wanna be that "d!ck" first responder and be like "search the forums noob" so I'm gonna give you this freebie
Aiite, from what I read so far from user AZHitman, the vert doors start as coupe doors...then has extra crap in them. Seems like there are mixed views on what exactly "more reinforcement" is. However, with that said, even with the coupe door swap, it will need some work. Heres the link that will take you to the magic spot:
zerothread?id=90488
About the weight:I hear the young guys around town say this kind of **** all the time. Don't worry about it. THe more money you got, the more power you can attain. Bottom line. In a fantasy world, everyone would have the same amount of money to put into their cars and then it would just be a matter of "skill of driver" + "actual potential limits of the vehicle you are driving". But this aint the fantasy world man - so get more loot and then you can talk the smack back to your buds.
Seriously though, who cares? I mean honestly, if you really cared enough about that kind of stuff then you wouldnt have bought a vert in the same place. Maybe you bought it b/c your on the same line as me:
1. it is still an s13 and you CAN swap a sr20 into it. It wont be as fast as a stock s13 hatchback with the swap, but again, more $$$ solves that problem. Thus, the potential is still there and its STILL A WAY better platform to start with than a civic.
2. Its a drop top. I know you've seen pics here and there online...even this forum is riddled with them. The car is, in my opinion, the most attractive 240sx out of the various models. I mean, who doesn't love a drop top?
3. You wanted something different and challenging (my main reason). Take it from me, a guy who has owned 8 cars over a period of 8 years...this is nice car. Good platform, easily modible, and "different". SHIFT_Diff my friend.
About the removal of top assembly and welding doors:
1. Leave the assembly and spent the time+money on other things. Calculate the loss of hp compared to other 240's b/c you have a vert and make that your goal to meet or exceed that number. Also, see my previous point #2.
Weld doors - wtf? You kidding right? naw man...that's not that hardcore man. What's hardcore is having a fast whip, and knowing how to handle it. How are you planning to get in/out? Dukes of Hazz style? (damn, I just saw that movie in my car on the way home from work - tonight). I don't know...it just seems so novelty-like. I mean, if you had a 5 speed swap...and a sr20 under the hood...and some race sponsers...yeah...but a stock car with welded doors? Just seems like too much trouble for nothing. If you are worried about stability of the car after the door mod, wouldnt it just be better to install a cage? That way you gain back your "lossed" reinforcement....then again..I'm not too keen on a cage in a vert...I don't know if it will look right...again, isn't that why alot of bought the verts in the first place? style?
- my 2 cents.
Oh btw, like I say in other responses. To each his own - so remember that whatver I say is just my opinion and I wouldnt want to force that on anyone...
Peace.