So this is my point to you- Really successful teams don't spend big on guards OR bigs. They get the free stats. PA and OD on the bigs, this stops the outside shooting success at big spots, the only kind that's cheap. The PA/DR on the bigs is more important than their expensive IS> Lots of teams skimp on SB to keep the big salary even lower.
I think a similar build can be created for a succesful outside team, but it requires players that simply don't exist on the market.
KK Mordor won the B3 three times, and I don't know if you saw his roster. But none of his players had passing... like they were all 10 or below other than one player with 13. This is because ALL of his players could score, his guards, like you pointed out, had 17+ IS which was basically free on the guard salary.
His bigs still cost 197k and 181k, while his guards cost 117k down to 68k and 53k (It's hard cause his players could play almost any position)
I believe a build like that could work very well for outside offenses, just with the cost distribution reversed.
For example
PG - 185k/week
SG - 185k/week
SF - 70k/week
PF - 80k/week
C - 80k/week
bGuard - 105k/week
bSF - 70k/week
bBig - 60k/week
Total: 835k/week (About KK Mordors payload)
In order to defend at all against LI the bigs would looks something like this
(http://i.imgur.com/XnURNyW.png)Which frees up the guards to be power houses like this
(http://i.imgur.com/Ic2SZHy.png)(Turns out when I maxed out a HoF I didn't even need to go to 185k thanks to the decrease in JR salary.
SF like this
(http://i.imgur.com/f1Bbk5Y.png)(Went a little higher to compensate for the guards)
I think any team today would have trouble stopping that, AND have trouble getting through that defensive wall both inside and out.