Thought I would share with you all my TB42 Turbo Build project for those whom are interested and maybe even get a few ideas and some help from you guys along the way.
Building The Top mount TB42 manifold
To make this project economical I am building several manifolds for other people that have expressed interest, I will be posing pictures as soon as i figure out how to do that ( the pictures not the manifold )
What Ive learnt so far ...
Longer equal length pipes before the collector provide more displacement for gas expansion after exiting the combustion chamber gasses are still expanding which means more to drive the turbine, insulated pipes dissipate less heat meaning gases continue expansion rather than start contraction as in a cast manifold which dissipates lots of heat, narrow pipes for provide higher velocity but can restrict top end rpms a balance of just the right size is needed and smooth polished surface for less turbulent flow, idealy after a good flowing header with not to much back pressure at top RPM's while still having a fast velocity at low rpms.
Almost sounds difficult ey'
Where its at .
T3 Turbo sit waiting to be mounted onto manifold other parts yet to be purchased.
After several hours of messing with CAD I have finally finished the tb42 head plate design and tested with some printed cutouts against my OLD tb42 Head which i will be using to bolt up on while welding.
The CAD files off to the Laser Cutters I hope to get down there and get a picture of them cutting the plates .
Have filled some pipes with sand for similar results to mandrel bending and done a few test bends on my 16 ton pipe bender which bends up to 3inch and they look great.
The bends will be cut and welded together into the final shape.
New Tig AC/DC welder for the job, with a variable pulse width and frequency and amps adjustments works so much better than using the Mig for this kind of thing, so I will have to make a few things now to pay for it.
Have gone with a Vband exhaust connection for the dump pipe and external waste gate hookup into a stainless 3inch exhaust.
Not sure how to fit in an intercooler in, know i want one just cant see where its going to fit, but with a big angle grinder and a no fear im sure I can get one in the front somewhere, but anyone with some pictures of these installed would be of interest to me.
shorty would probably wheel stand too much though 
t3 is worth anywhere from 50 to 1500 depending on specs. i've got an r33 turbo which has a t3 flange. paid 250 for it in good nick. could get something like adam's dads which is just a chinese one from ebay which is about the same new but i think they've blown two. 