I know everyone hates a thread being resurrected(for a third time), but i hate disinformation even more, and this thread still pops up on google searches.
$10k is nowhere near an accurate price to "custom" lift your mpv, much less any other car. Sure you could spend that much, or 10 times that much if you wanted, but $10,000 minimum is ridiculous. My neighbor put 4x4 toyota drive train under his Geo tracker in a weekend for less than $500. For $10k you could put unimog axles under it and have money left over.
As for axle stress, lift will not put much stress on your axles until it creates more angel than your cvjoint can handle, however the bigger tires that come after the lift will put stress on your axles>transfer case>torque converter depending on the size. Either way axle problems can be solved by having some made, buying a close match and have them re-splined at machine shop, or maybe just a different manufacturer, not all axles are equal just because they fit the same vehicle, and more often than not aftermarket axles don't compare to oem. Aftermarket axles usually use larger but fewer balls in the joints which makes for bigger gaps in between the ballbearings and leads to bind-up at less angle. An oem or a re-spline would be fairly cheap, even having a set made for you would only cost double, maybe triple the stock axle would cost and if you didn't abuse it might last 2 or 3 times longer. Do a bit of research and find a vehicle that has springs that will work to give you the lift you want, and head to the junkyard. Custom axles, junkyard springs, maybe have machine shop fab you tower spacers, could even go crazy and have panhard remounted and your still under $1000.
Also the mpv has a push button electronic center differential lock, 50/50 front/rear, not an "automatic front locking diff", and the mpv does not have hi/lo range, it does have a hold button allowing you to maintain the selected gear independent of vehicle speed and rpm.
So if you have an mpv, lift it, as long as you don't need a bolt on kit with step by step instructions then it is perfectly feasible to do on a modest budget.