I see what your saying in that some things crafted from flesh, glass etc. aren't really applicable as magic is at play. But it could be easy to make an analogy of the costs of making an automaton using existing constructs. For instance iron golem costs 80000 GP + 5600 XP and using devices it could be roughly replicated at a similar cost.
Due to its nature as a contruct have leeway on the slots factor (as i'd never be able to use the items so their pretty much for singular purpose and its whole body capacity is a slot) and use weight as appropriate for size. Devices: Low Light Vision (1000 gp, 1 cf), Grease (1000 gp, 1 cf), Bull's Strength (6000 gp, 2 cf), Darkvision (6000 gp, 2 cf), Stinking Cloud (15000 gp, 3 cf) = Total 29000 gp, 9 cf. Using longsword method for cost calculation (adamantine 3015- steel 315 = +2700 gp/cubic foot) 2700 gp/cf * 9 cf = 24300. So 53300 and we have a reasonable explanation for all the abilities given by MM except count it as having unreliable and no magic immunity with 26700 left to go till gp price is met. Round that to 25000 and use 2500 per +1 on unreliable roll. Keep it so natural 1 results in no action and exclude magic immunity/fire healing to account for no xp/no magic abilities of creator, hence if i cheap out and get bare bones iron golem then ~50% of the time i have a 50000gp/5000lb paperweight. Would take about a month to create and voila! Improv iron golem of a mechanical nature.
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Simpler examples for say hammerer could be
Devices: Low Light Vision (1000 gp, 1 cf), Grease (1000 gp, 1 cf), Bull's Strength (6000 gp, 2 cf) = Total 8000 gp, 4 cf. Use +1000 to lower unreliable and you have 18000 gp final cost. Roughly 1/4 of iron golem cost in accordance with CR.
Or pulverizer with LL Vision as opposed to Blindsight
Devices: Horizikaul's Boom (1000 gp, 1 cf), Low Light Vision (1000 gp, 1 cf), Grease (1000 gp, 1 cf), Bull's Strength (6000 gp, 2 cf), = Total 9000 gp, 5 cf. Use +1000 to lower unreliable and you have 19000 gp final cost. Roughly 1/4 of iron golem in accordance with CR.
Or basic pet like an eagle or hawk
Devices: Grease (1000 gp, 1 cf) = Total 1000 gp, 5 cf. Use +100 to lower unreliable and you have 2000 gp final cost. Basically a scout only capable of listen, spot, optionally screeching to warn and simple attack.
Basically
1. Grease as a must have for any creature then improve its abilities with standard two slot devices to a max of say small/med/large (1/3/5) and one slot devices increasing this overall capacity by one or two devices.
2. Bull's Strength or Cat's Grace as must have device for exceptionally strong or dextrous creations. i.e 18 or greater abilities like hammerer (str) or leopard (dex)
3. Improvements to unreliable (which all have since they're non magically crafted) be as expensive as you need to make sure my creations aren't completely overpowered.
4. Certain non-replicable abilities eliminated to once again controll overpowering.
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This wouldn't be really time consuming as it's unlikely i'll be using this option alot but it'd be nice to know the option existed for discussion. I'm actually kind of proud of my iron golem adaptation haha. Either way, lemme know what ya think as this is my first foray into actually sitting down and analyzing D&D to any great extent
http://www.wizards.com/default.asp?x=dnd/sg/20050923a
and this link kinda explains why i brought it up as otherwise i have this strange feeling i'm gonna be somewhat underpowered after a while. (and ahead of time i know this isn't an eberron game and you don't have the books but what good is an artificer who can't even make a robot dog? haha)