[CQ-Contest] connecting more than one stubs

[Kostas SV1DPI]

Hello to all
I am trying to make stubs for my club and i need your help.
We have 2 ant: one is x7 (10, 15, 20) and the other one a exp14 with 40m 
kit (10, 15, 20, 40).
What i have done until now is to follow the most of k2tr and k1ttt 
advices and make 2 stubs, 23 feet each. So we can change between bands 
just sort or unsort  the end of the stub in every antenna. Te bad thing 
is we have not additional isolation form stubs on 10 (11'6" missing) and 
on 40m (15'3" and 7'8" are missing also).
My questions now...
1)Do i need to have a minimum distance on 10m between 11'6" and 23' stubs?
2)It is not so clear to me how i should connect the additional 40m 
stubs. Minimum distances agn?
3)Trying to keep things simple as the change from band to band is manual 
right now, my thought is in x7 (10, 15,20) to have 2 T-connectors. So on 
10m we connect 23'open and 11'6"open. On 15m we short the 23' and change 
the 11'6" with another shorted 23' for additional attenuation. And on 
20m we have the 23' open and 11'6" shorted. Is my thought ok? Do i need 
to avoid anything?
4) Probably for the exp14 (10,15,20,40) i need to put 3 T-connectors (to 
cover 40m), so things are not so simple (!) or i am missing something?

73 Kostas SV1DPI