Don't give up!! All you need is time and inspiration (and an tolerant other half if applicable!)
The only thing I've got that makes thing easier is my lasercutter (Which is almost cheating!) which is good for repetitive tasks and fiddly bits.
The Reichstag would be difficult without the laser cutter, you could make it from foamcore but it would take a lot longer.
The ancillary buildings, however,don't need the laser. They take about 2 hours all in - can do a how-to if there is an interest - with some foamcore, some MDF, some corrugated craft paper and some glue you can easily make similar. Only the windows on the barrel roofed building and the front props on the tin shed are laser cut.
Due to a change of circumstances (A good one!) the Reichstag building will be up for sale at the end of the year.