If it doesn't take things to far astray, I have a sort of related question.

When I was originally going to build this wheelset up, I was going to use a different frame for the same purpose (commuting, touring, maybe a bit of gravel, all around riding). So I got a geat deal on a lightly used Shimano DH-3N80 front hub with a new light and an unused Ultegra 6700 rear hub in another great deal. So two bargains on hubs with matching finish that I thought I could use together. The thing is, this bike has a 135 mm rear triangle spacing. I asked about using a different wheelset that I already had on hand with the frame over in mechanics and the consensus was to just add a 5 mm spacer to the non-drive side and re-dish and get a new skewer before the conversation devolved into how big a mm is and how much flex aluminum can handle.

Since I'm building up a wheelset for this frame now, does it still make sense to put an extra spacer on the nondrive side and build it up with this hub since it's what I have on hand (and I like to save money), or since it is ultegra which is a racing model with a slightly too short axle (the 130 mm axle will probably only go halfway into each of the dropouts), should I replace it with a more sturdy hub before starting (or take the middle route and just replace the axle and put an extra spacer on there). I really like the idea of using what I have since it's pretty and I already have it, but, if I'd be better off getting a new hub, now is the time before I start ordering spokes and building.