I have just been offered a heavily mod'd pair of Belle and am curious how such work affects value. Price is yet to be discussed. Mods include ALK XO, Martinelli wood horns, Altec 902 and Beyma CP25. These are DIY changes but photos indicate the work is of high quality. In this enthusiast market, is the value of the speaker enhanced $ for $ invested; does the value remain unchanged; or is it diminished due to mods. For this purpose, since I have yet to see the speakers and assuming very good condition, what is the estimated value range?