Kitbashing ramblings.............
B-45 is a rarely mentioned jet. Mach2 has a pricey 1/72 kit, otherwise no B-45s out there.
To kitbash a "B-45 like" 1/72 model; can use 1/48 Arado 234 4-jet version wings. Wing span of both models are close.
For a basis fuselage a 1/72 Rita might be used. Is same length as B-45. Rita fuselage looks more jet like (to me) than other WW2 bombers that approx size. Replace rudder & tail wings (rear of fuselage?) with something non-Rita. Trying to avoid obvious rewing of well known bomber (B-24 etc).
Do need to work landing gear into Arado wing or build gear up.