I don't see any wrong with Phil's post. This system is practiced in the NZ & Oz.
You can descent up to your MDA and continue it till the MAPt. or till you become visual.
And as stated by Phil lateral is 5 deg on both sides
And even though vertical is limited to the MDA, I've seen many renowned operators go a bit below, say nothing more than 50-70ft to catch a glimpse of the ground to go for an approach.
Hope this helps.
KJ