Thank you so very much! This added quite some perspective to my approach.
I followed your instructions successfully until
#tensorflow itself
make -j4 -f tensorflow/contrib/makefile/Makefile HOST_OS=PI TARGET=PI ANDROID_TYPES=-D__ANDROID_TYPES_FULL__
OPTFLAGS="-Os -mfpu=neon-vfpv4 -funsafe-math-optimizations -ftree-vectorize" CXX=g++-4.8
The process started running and did for a very little while, then it threw the following:
...
/home/linaro/tensorflow/tensorflow/contrib/makefile/gen/host_obj/tensorflow/core/example/feature.pb.o /home/linaro/tensorflow/tensorflow/contrib/makefile/gen/host_obj/tensorflow/core/example/example.pb.o /home/linaro/tensorflow/tensorflow/contrib/makefile/gen/host_obj/tensorflow/core/grappler/costs/op_performance_data.pb.o -L/usr/local/lib tensorflow/contrib/makefile/compile_nsync.sh -lstdc++ -lprotobuf -lpthread -lm -lz -ldl -lpthread
tensorflow/contrib/makefile/compile_nsync.sh: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
tensorflow/contrib/makefile/Makefile:808: recipe for target '/home/linaro/tensorflow/tensorflow/contrib/makefile/gen/host_bin/proto_text' failed
make: *** [/home/linaro/tensorflow/tensorflow/contrib/makefile/gen/host_bin/proto_text] Error 1
Following the somewhat matching advice here i ran compile_nsync.sh and replaced the exports with
export HOST_NSYNC_LIB=tensorflow/contrib/makefile/downloads/nsync/builds/default.linux.c++11/nsync.a
export TARGET_NSYNC_LIB="$HOST_NSYNC_LIB"
which made the whole process run seemingly.
Now that last part of your instructions seems to be all Greek to me (but that might just be the time of day 
), so it will be on tomorrows todo-list. I’ll report back again how it went when i got to it. Meanwhile, thank you again!
P.S.: Not sure the g+±4.8 in your instructions but i replaced them with g++-4.8
P.P.S.: And just now i notice that conflation of + and - seems to be a feature of this editor which can be masked out.