There's a difference in cost as well. Using the above example, I can obtain the individual components myself without paying any extra cost for a time of 2 days while asking the fixer to go get the coat with the pulse weave, which will take about 2 weeks, and cost an additional 75% for dice, than an additional 10% for fixer fee. I don't know what, if anything, I should add for the assembly cost for this yet method yet.
If I do it that way, I only end up spending ~15,700 nuyen on the final product, after spending 2 days tracking down the individual components myself, I can get the coat back in 2 weeks with all the modifications
If I do it all in one big purchase, it'll only take 2 weeks, but it'll cost about 18,500 nuyen instead.