Stairs design advice

[MortarThePoint]

I'm making an cut stringer staircase where spindle placement needs to be considered more carefully than with a normal closed stringer stair where the spindles' positions don't need to bear any relation to the treads. We need at least 2 spindles per tread to satisfy the <100mm gap required by buildings regs. The common approach seems to be to align the front edge of the front spindle with the front face of the riser. I have shown this in the first two CAD images. I think I prefer to centre the spindles on the tread (excluding nosing and 'back nosing'), but that has the following two 'characteristics':

1. Spindles 'clash' with Newel posts, which I think looks OK but maybe that's because I have looked at it like that for too long,
2. Nosing of the next step up gets close (14.5mm) to the back edge of the back spindle

Which way do you prefer? Do you have any other thoughts?

 

32mm spindles, 222mm going.

 

Spindles centred on tread:

 

The normal way (as far as I can tell):

Gap from newel to first spindle 66mm, gap to last spindle is 34mm.

Sorry about the bit of skirting board shown in the background.

 

Edited Thursday at 10:43 by MortarThePoint

[nod]

I prefer to get the newels and rails in and set each one out individually 

[Mr Punter]

I can't see the images.