Actually I would try a quick re-make - but only after explaining to the owner that there is a likelihood it may be destroyed. I would use a moist box for a week or so and inject water under key areas to soften up the bird. Likely with such a poor mount that "taxidermist" (and I use that term loosely) probably didn't wrap a tight excelsior body and you could man-handle the existing body to fit the approximate correct one and adjust posture. Removing the whole body would double the time involved. Actually you could wait a year or so and perhaps get a new eagle from the BP spill. I have a copy of the old US Dept of Interior Memo in Anchorage of the carcasses available from the Exxon Valdez Oil spill that one could order whatever number of specimens you wished to have before they were incinerated in Sept 1992 - the memo dated August 07 1992. The spill was in 1989. Thus the BP birds should be available about 2012-2013. Oil spill birds aren't always in that bad of shape - I have handled many over the years. Sometimes they simply ingest the wrong food and they die from starvation. Plumage is not always ruined.. The total number of Bald Eagles available from Exxon Valdez was 125. The whole list is amazing, but I image LSU will claim most birds in the current spill - if many birds end up kicking the bucket.