DIY nursing bra from a normal bra?

Rebecca
I have a large chest and am having a heck of a time finding a nursing bra that is the least bit flattering.  I am not concerned about nursing around the house in an unflattering bra, but want to make sure I am comfortable and feel confident when I go back to work and am pumping.  I have tried some pretty nice ($) bras and some less expensive ones and do not like the way my chest looks in any of them!  I saw that some nordstroms will convert a normal bra to a nursing bra for a nominal fee ($10) and I am also decent at sewing and thought about buying a couple normal wire free bras that are flattering and comfortable and just converting them myself.  There are also a lot of DIY websites about it and it doesn't look too difficult.  Has anyone else gone this route?  Recommendations or suggestions???