Are you looking for info on how to tune an mTDI pump, on how to rebuild a Bosch VE mechanical pump, or are you trying to find info on how to build a direct injection pump out of an older VW indirect injection pump? If you were asking for the latter, I highly advise against attempting that if you need a step by step writeup to guide you. The pump itself needs bored out from 17mm to 20mm to take the stronger main shaft that the direct injection pressures require, as well as needing someone who knows advanced tuning and setup on the dynamic timing and governor areas of the pump.
I can guide you to a decent rebuild tutorial at least, if that is what you are looking for, but I'd highly suggest getting a Land Rover pump from doing a web search using quotation marks around the pump number to find salvage shops selling them for cheap, and then do a proper rebuild or at least disassembly, cleaning, and resealing of the internals, marking the exact positions and settings of everything as you disassemble them...
This is a really good basic guide, although REALLY doing a proper rebuild means putting it on a Bosch test bench to measure the output of each cylinder's injection quantity as well as other calibrations regarding case pressure etc. If the internal case pressure is still plenty good, the pump most likely only could really need a good cleaning and resealing. It's nice to get one that was on a good runner and hasn't been sitting on a shelf for years with the lines not really sealed off. Or one that'sbeen filled with LiquiMoly Diesel Purge on last run, and properly sealed up for storage after removal.
http://contrails.free.fr/engine_bosch_ve_en.phpI saved that webpage as a PDF for future reference.