I actually considered buying a cheap bench with some sort of attached squat rack but taking into account the space it requires (and my financial situation) I never did. I found that the zecher squat required no rack as I could deadlift the barbell on my thighs and place it into the proper place on the inner side of my elbows. I, in fact, were learning power clean and squat clean with support exercises (mainly clean pull and romanian deadlift) and I actually managed to do squat cleans at one point with light weights but I don't think I ever found the right place for the barbell because my shoulders were sore for some time after it.
I've done zecher squats with very narrow stance (knees roughly as wide as my hips) to hit my quads and then relied on stiff-legged deadlifts for my hamstrings. I tried pistol squats once but my balance wasn't good enough back then, I'm not sure if I could pull them off now. As foor the floorpress with barbell - I suppose I could make some sort of little wooden stand where I could easily lift the barbell to right position. If you know some manufacturer(s) that make stands for floorpresses feel free to suggest them. I've personally never seen one. And no, there is really no slopes nor stairs here. I have a thick plank for my calf raises so a staircase isn't needed.
I've done my lats with various different pull-ups and I found a grip slightly wider than my shoulders being good. That's why the pull-overs I meant were for chest. I tried doing them once on the swiss ball with a dumbbell but I couldn't really hit my chest; I spent way too much energy trying to balance on it. I never thought the bent-over rows with barbell and dumbbell, both of which I regularily do, are good substitutes for various cable pulls. I also tried the chair dips a couple of time but I never managed to hit my chest with them - that's why the dips that are meant for chest have caused me some trouble.
Thanks for all the suggestions. I wrote them down and I'll try them shortly. Also, isn't 5/3/1 more of strength than mass program?
edit: I've done my exercises with a strick form and the 4 seconds down, 2 seconds up -rule. Is that good or should I do something else?
edit2: I also forget to mention that after a year I must go to army then I can use the gym there is. Until that I can only work out in home.
edit3: Could a basic push/pull/legs split with template like this be decent with rest beetween reps being 60-90s:
Military press 3x8
Floor press 3x8
French press 2x8
DB flys 2x8
Weighted pull-ups 3x8
Barbell bent-over rows 3x8
Hammer curls 2x8
Wrist curls or reverse wrist curls 2x8
Narrow zecher squat 3x8
Stiff-legged deadlift 3x8
One-legged calf raises 3x8
Weighted crunches 3x8