kb,
As Wouter has inferred it is all about the journey.
You have to want to sail your own creation.
I can asure you that if you build this boat because you want to build your own boat you will get a surge of satisfaction and pride every time you put the boat in the water.

I have built a numbe r of Taipans in addition to my own. Mostly just helping mates out and I just happen to enjoy building and have the facilities. So if there is anything I can do to help out just email me and I will be glad to do what I can.

I think I still have around 13 files of text and a heap of photos describing the project if it is of any help.

Just to quantify some of the dollars:-
I pay $59 per sheet of Okume ply to BS1088 standard.
Don't be tempted to use anything else or you won't get the weight. If you already have the plans you will know how many sheets you will need.
In theory you can get away with 4.8letres of resin but I have never managed this. I end up using around twice that and much of it ends up as waste. I always divide the job up into small tasks and this approach can waste the resin a little. So I always budget on 10 litres.
You can make your own boards but I wouldn't. It is unlikely you will be able to do as good as a pro and these boats rely very heavily on a low drag lift ratio. There is no real difference in the hull ply or glass but I would suggest you consider your boards differently.

Apart from that, the cost will depend a little on if you are trying to build a class leagal Taipan specs. The mods Wouter suggested would not be permitted for a class leagal T4.9.You should be aware of this. Now if you want a class leagal F16 this opens up some options that will most likely prove to be less expensive and more along the lines of what Wouter has suggested.
I sailed Wouter's boat when I was in the Netherlands last year and it is my opinion that they have taken the T4.9 a step forward.

Good luck.
Enjoy the journey.

Regards,
Phill