I have a Horseman LS, which is very similar to the L45 Pro, but it also has base tilt and it has the expandable rail rather than the fixed length monorail, which weighs more. The Horseman L series is a very solid, precision monorail. The L45 is stated to be 4.6Kg, and I just measured my LS at 6.1Kg (13 lb. 10 oz.). But you would be carrying 2500 extra grams (5lb 5oz) whenever you brought all three monorails. That is exclusive of lens boards with lenses; and don't forget you will be hefting those around, too. (My lenses on lens boards are in the range of 1lb 2oz - 2lb 0oz. ) And then each of the film holders... 6-1/8 oz
But, although I have taken my own kit outdoors 'into the field' a few times, and on location for fixed location indoor commercial shoots a number of times, I would not take it outdoors as a routine! Simply changing L45 monorails is a pain in the field (and I can avoid that task with the expandable monorail).
I have a Dynalite soft case which I customized to fit the Horseman LX, but it is a bit of a cumbersome load when accompanied by the bag with lenses, the bag with film holders, and a sturdy tripod! (second photo shows a lensboard with adapter to mount a Canon dSLR!)
Getting a full kit with variety of bellows and monorails as you listed would List for $5200 according to the 1992 Horseman price list, and getting it all for $450 is a steal.