First grow box (size and lightning questions generally)

I am making the first grow box ever, and I have no skill whatsoever.
Dimensions for now are - H 55cm / 38cm / 38 cm (or 21.6" / 15" / 15").

I am considering buying autoflowering 5x Snowryders (which are only available as feminized) from shortstuff seedbank. Approximate height for these are 25 - 38 cm (10 – 15 inches), according to their webpage. Is it good considering I need to use HPS lamp so close + pot size?

First question would be - i need 150W or 250W HPS bulb? Maybe I should consider MH / CFL?
I understand the thing about the ventilation and odour.

Also - cloning question, I found that you can't clone them - so how to get more seeds (instead of buying them), but they are only available as feminized?

Maybe I should consider growing different type? Growbox height is not changeable - and it needs to be Sam Fisher stealth-like.

Regards,

--dzejnieks

*bump* *bump* *bump*

so, you want to know how to put a car in a shoe box? seriously, that is not enough room to grow any meaningful amount of weed - like you might produce a week's worth every 3 months - which is ok i guess for a hobby but it takes a lot of effort and not a little risk to play. if you insist on that space, grow one lowryder at a time with about 75 actual watts of cfl.