Yes, quite amazing. Weight was precious, and there was considerable work reducing it, hence foil and a somewhat stark appearance. A quote from this page, regarding weight and the LM:
http://www.hq.nasa.gov/office/pao/Hi...205/ch7-3.html
By the end of 1965, Scrape and SWIP had pruned away 1,100 kilograms, providing a comfortable margin below the control weight limit. One of the more striking changes to come from this drive for a lighter spacecraft was the substitution of aluminum-mylar foil thermal blankets for rigid heatshields. The gold wrapping characteristic of the lander's exterior saved 50 kilograms.20
Many of these weight-reducing changes made the lander so difficult to fabricate, so fragile and vulnerable to damage, that it demanded great care and skill by assembly and checkout technicians. Structural components took on strange and complex shapes, requiring careful machining to remove any excess metal - a costly and time-consuming process even after vendors had been found who would make these odd looking parts.
By the way, there's a lot of good information here:
http://www.hq.nasa.gov/office/pao/Hi.../contents.html